| Criteria: found in Modoc County • is native • group by lifeform | ||||
| 2475 records | include photos for these plants | # number of sources | ||
| Scientific Name | Common Name | Lifeform | # |
Lifeform: Annual | 601 plants | ||
|
Lifeform: Biennial | 2 plants | ||
Lifeform: Perennial | 1562 plants | ||
| Achillea millefolium | Yarrow | Perennial herb | 70 |
| Achnatherum Xbloomeri | Perennial grass | ||
| Achnatherum hymenoides | Indian rice grass | Perennial grass | 8 |
| Achnatherum lemmonii | Lemmon's stipa | Perennial grass | 1 |
| Achnatherum lemmonii ssp. lemmonii | Lemmon's needlegrass | Perennial grass | |
| Achnatherum lettermanii | Letterman stipa | Perennial grass | 1 |
| Achnatherum nelsonii | Columbia needlegrass | Perennial grass | 1 |
| Achnatherum nelsonii ssp. dorei | Mountain needlegrass | Perennial grass | 1 |
| Achnatherum nevadense | Sierra needlegrass | Perennial grass | |
| Achnatherum occidentale | Western needlegrass | Perennial grass | 1 |
| Achnatherum occidentale ssp. californicum | California needlegrass | Perennial grass | |
| Achnatherum occidentale ssp. occidentale | Western needlegrass | Perennial grass | |
| Achnatherum occidentale ssp. pubescens | Elmer's needlegrass | Perennial grass | |
| Achnatherum pinetorum | Pinewoods needlegrass | Perennial grass | |
| Achnatherum thurberianum | Thurber stipa | Perennial grass | |
| Achnatherum webberi | Webber's needlegrass | Perennial grass | |
| Acmispon nevadensis | Sierra lotus | Perennial herb | |
| Acmispon nevadensis var. nevadensis | Sierra nevada lotus | Perennial herb | |
| Aconitum columbianum | Monkshood | Perennial herb | 4 |
| Aconitum columbianum ssp. columbianum | Columbian monkshood | Perennial herb | |
| Actaea rubra | Baneberry | Perennial herb | 7 |
| Adenocaulon bicolor | Trail plant | Perennial herb | |
| Agastache parvifolia | Small leaved horsemint | Perennial herb | |
| Agastache urticifolia | Horse mint | Perennial herb | 6 |
| Ageratina occidentalis | Western eupatorium | Perennial herb | 4 |
| Agoseris Xdasycarpa | Perennial herb | ||
| Agoseris aurantiaca | Orange flowered agoseris | Perennial herb | 1 |
| Agoseris aurantiaca var. aurantiaca | Orange agoseris | Perennial herb | |
| Agoseris glauca | Short beaked agoseris | Perennial herb | |
| Agoseris glauca var. glauca | Short beaked agoseris | Perennial herb | |
| Agoseris glauca var. laciniata | False dandelion | Perennial herb | |
| Agoseris glauca var. monticola | Mountain agoseris | Perennial herb | |
| Agoseris grandiflora | Giant mountain dandelion | Perennial herb | 3 |
| Agoseris grandiflora var. grandiflora | Giant mountain dandelion | Perennial herb | |
| Agoseris monticola | Mountain agoseris | Perennial herb | |
| Agoseris parviflora | False dandelion | Perennial herb | |
| Agoseris retrorsa | Spear leaved agoseris | Perennial herb | 1 |
| Agrostis exarata | Bentgrass | Perennial grass | 5 |
| Agrostis humilis | Mountain bent grass | Perennial grass | |
| Agrostis idahoensis | Colonial bentgrass | Perennial grass | 3 |
| Agrostis pallens | Diego bent grass | Perennial grass | 14 |
| Agrostis scabra | Rough bentgrass | Perennial grass | 4 |
| Agrostis scabra var. geminata | Rough bentgrass | Perennial grass | 4 |
| Agrostis thurberiana | Thurber's bentgrass | Perennial grass | |
| Agrostis variabilis | Mountain bentgrass | Perennial grass | |
| Alisma gramineum | Grass leaf water plantain | Perennial herb | |
| Alisma plantago-aquatica | Water plantain | Perennial herb (aquatic) | 5 |
| Alisma triviale | Northern water plantain | Perennial herb (aquatic) | 5 |
| Allium acuminatum | Taper tipped onion | Perennial herb (bulb) | 7 |
| Allium amplectens | Narrow leaved onion | Perennial herb (bulb) | 3 |
| Allium anceps | Twin leaved onion | Perennial herb (bulb) | |
| Allium bisceptrum | Twincrest onion | Perennial herb (bulb) | |
| Allium bisceptrum var. bisceptrum | Twin crest onion | Perennial herb (bulb) | |
| Allium bolanderi | Bolander's onion | Perennial herb (bulb) | |
| Allium bolanderi var. mirabile | Bolander's onion | Perennial herb (bulb) | |
| Allium campanulatum | Dusky onion | Perennial herb (bulb) | 2 |
| Allium fimbriatum | Wild onion | Perennial herb (bulb) | 1 |
| Allium fimbriatum var. fimbriatum | Fringed onion | Perennial herb (bulb) | |
| Allium lemmonii | Lemmon's onion | Perennial herb (bulb) | 1 |
| Allium parvum | Dwarf onion | Perennial herb (bulb) | 1 |
| Allium platycaule | Broad stemmed onion | Perennial herb (bulb) | 2 |
| Allium punctum | Punctate onion | Perennial herb (bulb) | |
| Allium tolmiei | Tolmie's onion | Perennial herb (bulb) | |
| Allium tolmiei var. tolmiei | Tolmei's onion | Perennial herb (bulb) | |
| Allium validum | Swamp onion | Perennial herb (bulb) | 5 |
| Alopecurus aequalis | Sonoma alopecurus | Perennial grass | |
| Alopecurus aequalis var. aequalis | Shortawn foxtail | Perennial grass | |
| Alopecurus geniculatus | Marsh foxtail | Perennial grass | |
| Amphiscirpus nevadensis | Great basin bulrush | Perennial grass | |
| Anemone drummondii | Drummond's anemone | Perennial herb | 2 |
| Anemone occidentalis | Western anemone | Perennial herb | 3 |
| Anemopsis californica | Yerba mansa | Perennial herb | 31 |
| Angelica capitellata | Grayswamp whiteheads | Perennial herb | 2 |
| Antennaria argentea | Silvery everlasting | Perennial herb | |
| Antennaria dimorpha | Gray cushion pussytoes | Perennial herb | |
| Antennaria flagellaris | Stoloniferous pussytoes | Perennial herb | |
| Antennaria geyeri | Geyer's pussytoes | Perennial herb | |
| Antennaria luzuloides | Silvery brown pussytoes | Perennial herb | |
| Antennaria luzuloides ssp. aberrans | Rush pussytoes | Perennial herb | |
| Antennaria luzuloides ssp. luzuloides | Rush pussytoes | Perennial herb | |
| Antennaria rosea | Rosy everlasting | Perennial herb | 2 |
| Antennaria rosea ssp. confinis | Rosy pussytoes | Perennial herb | |
| Antennaria rosea ssp. rosea | Rosy pussytoes | Perennial herb | |
| Antennaria umbrinella | Brown pussytoes | Perennial herb | |
| Aphyllon fasciculatum | Clustered broomrape | Perennial herb (parasitic) | |
| Apocynum androsaemifolium | Spreading dogbane | Perennial herb | 1 |
| Apocynum cannabinum | Indian hemp | Perennial herb | 11 |
| Aquilegia formosa | Columbine | Perennial herb | 54 |
| Arabis cobrensis | Masonic rock cress | Perennial herb | |
| Arabis davidsonii | Davidson's rock cress | Perennial herb | |
| Arabis drummondii | Drummond's rock cress | Perennial herb | |
| Arabis eschscholtziana | Eschscholtz's hairy rockcress | Perennial herb | |
| Arabis glabra | Smooth rock cress | Perennial herb | |
| Arabis glabra var. furcatipilis | Smooth rock cress | Perennial herb | |
| Arabis glabra var. glabra | Smooth rock cress | Perennial herb | |
| Arabis hirsuta var. glabrata | Mountain rock cress | Perennial herb | |
| Arabis holboellii | Holboell's rock cress | Perennial herb | |
| Arabis holboellii var. pinetorum | Pine rockcress | Perennial herb | |
| Arabis holboellii var. retrofracta | Backward splitting holboell's rock cress | Perennial herb | |
| Arabis lemmonii | Lemmon's rock cress | Perennial herb | |
| Arabis lemmonii var. lemmonii | Lemmon's rock cress | Perennial herb | |
| Arabis lyallii | Lyall's rock cress | Perennial herb | 1 |
| Arabis lyallii var. lyallii | Lyall's rockcress | Perennial herb | |
| Arabis lyallii var. nubigena | Lyall's cloud cress | Perennial herb | |
| Arabis microphylla | Littleleaf rockcress | Perennial herb | |
| Arabis microphylla var. microphylla | Small leaved rock cress | Perennial herb | |
| Arabis oregana | Oregon rock cress | Perennial herb | |
| Arabis platysperma | Broad seeded rock cress | Perennial herb | |
| Arabis platysperma var. platysperma | Broad seeded rock cress | Perennial herb | |
| Arabis puberula | Blue mountain rock cress | Perennial herb | |
| Arabis sparsiflora | Sicklepod rock cress | Perennial herb | 2 |
| Arabis sparsiflora var. arcuata | Elegant rockress | Perennial herb | |
| Arabis sparsiflora var. californica | California elegant rock cress | Perennial herb | 1 |
| Arabis sparsiflora var. sparsiflora | Elegant rock cress | Perennial herb | 2 |
| Arabis sparsiflora var. subvillosa | Hairy stemmed elegant rock cress | Perennial herb | |
| Arabis subpinnatifida | Klamath rockcress | Perennial herb | |
| Arabis suffrutescens | Woody rock cress | Perennial herb | |
| Arabis suffrutescens var. suffrutescens | Woody rockcress | Perennial herb | |
| Arceuthobium abietinum | Fir dwarf mistletoe | Perennial herb (parasitic) | |
| Arceuthobium californicum | Sugar pine dwarf mistletoe | Perennial herb (parasitic) | |
| Arceuthobium campylopodum | Pine dwarf mistletoe | Perennial herb (parasitic) | |
| Arceuthobium cyanocarpum | Blue berry dwarf mistletoe | Perennial herb (parasitic) | |
| Arceuthobium divaricatum | Western dwarf mistletoe | Perennial herb (parasitic) | |
| Arceuthobium littorum | Seashore dwarf mistletoe | Perennial herb (parasitic) | |
| Arceuthobium monticola | Mountain dwarf mistletoe | Perennial herb (parasitic) | |
| Arceuthobium occidentale | Digger pine dwarf mistletoe | Perennial herb (parasitic) | |
| Arceuthobium siskiyouense | Siskiyou dwarf mistletoe | Perennial herb (parasitic) | |
| Arceuthobium tsugense | Hemlock dwarf mistletoe | Perennial herb (parasitic) | |
| Arceuthobium tsugense ssp. mertensianae | Mountain hemlock dwarf mistletoe | Perennial herb (parasitic) | |
| Arceuthobium tsugense ssp. tsugense | Hemlock dwarf mistletoe | Perennial herb (parasitic) | |
| Arenaria aculeata | Prickly sandwort | Perennial herb | |
| Arenaria congesta | Capitate sandwort | Perennial herb | 1 |
| Arenaria congesta var. congesta | Capitate sandwort | Perennial herb | |
| Arenaria congesta var. crassula | Rough sandwort | Perennial herb | |
| Arenaria congesta var. simulans | Capitate sandwort | Perennial herb | |
| Arenaria congesta var. subcongesta | Capitate sandwort | Perennial herb | |
| Arenaria congesta var. suffrutescens | Suffrutescent sandwort | Perennial herb | |
| Arenaria kingii ssp. compacta | King's sandwort | Perennial herb | |
| Arenaria kingii var. glabrescens | King's smooth sandwort | Perennial herb | |
| Arenaria pumicola var. californica | Pumice sandwort | Perennial herb | |
| Arnica chamissonis | Chamisso arnica | Perennial herb | 6 |
| Arnica chamissonis ssp. foliosa | Meadow arnica | Perennial herb | 6 |
| Arnica cordifolia | Heart leaved arnica | Perennial herb | 1 |
| Arnica cordifolia var. cordifolia | Heart leaved arnica | Perennial herb | |
| Arnica discoidea | Rayless arnica | Perennial herb | |
| Arnica diversifolia | Lawless arnica | Perennial herb | |
| Arnica fulgens | Hillside arnica | Perennial herb (rhizomatous) | |
| Arnica longifolia | Seep spring arnica | Perennial herb | |
| Arnica mollis | Cordilleran arnica | Perennial herb | 1 |
| Arnica nevadensis | Sierra arnica | Perennial herb | 1 |
| Arnica ovata | Sticky leaf arnica | Perennial herb | |
| Arnica parryi | Nodding arnica | Perennial herb | |
| Arnica parryi ssp. sonnei | Sonne's nodding arnica | Perennial herb | |
| Arnica sororia | Twin arnica | Perennial herb (rhizomatous) | |
| Arnica tomentella | Recondite arnica | Perennial herb | 1 |
| Artemisia douglasiana | California mugwort | Perennial herb | 35 |
| Artemisia dracunculus | Tarragon | Perennial herb | 11 |
| Artemisia ludoviciana | Silver wormwood | Perennial herb | 17 |
| Artemisia ludoviciana ssp. candicans | Gray mugwort | Perennial herb | |
| Artemisia ludoviciana ssp. incompta | Western mugwort | Perennial herb | |
| Artemisia ludoviciana ssp. ludoviciana | Silver wormwood | Perennial herb | 3 |
| Artemisia michauxiana | Lemon sagewort | Perennial herb | 2 |
| Aruncus dioicus | Bride's feathers | Perennial herb | 11 |
| Aruncus dioicus var. acuminatus | Bride's feathers | Perennial herb | 1 |
| Aruncus dioicus var. pubescens | Goats beard | Perennial herb | |
| Asclepias cordifolia | Purple milkweed | Perennial herb | 8 |
| Asclepias fascicularis | narrow leaf milkweed | Perennial herb | 31 |
| Asclepias speciosa | Showy milkweed | Perennial herb | 39 |
| Aster alpigenus var. andersonii | Alpine aster | Perennial herb | 1 |
| Aster ascendens | Long leaved aster | Perennial herb | |
| Aster campestris | Western meadow aster | Perennial herb | |
| Aster eatonii | Eaton's aster | Perennial herb | 2 |
| Aster foliaceus | Leafy aster | Perennial herb | 1 |
| Aster foliaceus var. apricus | Parry's leafy aster | Perennial herb | 1 |
| Aster foliaceus var. parryi | Parry's aster | Perennial herb | 1 |
| Aster integrifolius | Entire leaved aster | Perennial herb | |
| Aster occidentalis | Western mountain aster | Perennial herb | 1 |
| Aster occidentalis var. occidentalis | Western mountain aster | Perennial herb | |
| Aster scopulorum | Lava aster | Perennial herb | |
| Astragalus andersonii | Anderson's rattle weed | Perennial herb | |
| Astragalus austiniae | Austin's milk vetch | Perennial herb | |
| Astragalus californicus | Klamath milk vetch | Perennial herb | |
| Astragalus canadensis | Canadian milkvetch | Perennial herb | 1 |
| Astragalus canadensis var. brevidens | Short toothed milk vetch | Perennial herb | |
| Astragalus curvicarpus | Curvepod milkvetch | Perennial herb | |
| Astragalus curvicarpus var. curvicarpus | Curved pod milk vetch | Perennial herb | |
| Astragalus filipes | Narrow pod locoweed | Perennial herb | |
| Astragalus gibbsii | Gibbs locoweed | Perennial herb | |
| Astragalus inversus | Susanville milk vetch | Perennial herb | |
| Astragalus lemmonii | Lemmon's milk vetch | Perennial herb | |
| Astragalus malacus | Shaggy milk vetch | Perennial herb | |
| Astragalus obscurus | Basalt milk vetch | Perennial herb | |
| Astragalus pulsiferae | Pulsifer's milk vetch | Perennial herb | |
| Astragalus pulsiferae var. coronensis | Modoc plateau milk vetch | Perennial herb | |
| Astragalus pulsiferae var. pulsiferae | Pulsifer's milk vetch | Perennial herb | |
| Astragalus pulsiferae var. suksdorfii | Suksdorf's milk vetch | Perennial herb | |
| Astragalus purshii | Pursh's sheeppod | Perennial herb | 3 |
| Astragalus purshii var. lagopinus | Pursh's milk vetch | Perennial herb | |
| Astragalus purshii var. lectulus | Pursh's milk vetch | Perennial herb | |
| Astragalus purshii var. purshii | Pursh's milk vetch | Perennial herb | |
| Astragalus purshii var. tinctus | Pursh's milk vetch | Perennial herb | 1 |
| Astragalus whitneyi | Whitney's milk vetch | Perennial herb | 1 |
| Astragalus whitneyi var. confusus | Whitney's milk vetch | Perennial herb | 1 |
| Astragalus whitneyi var. lenophyllus | Whitney's milk vetch | Perennial herb | |
| Astragalus whitneyi var. siskiyouensis | Siskiyou milk vetch | Perennial herb | |
| Atriplex gardneri | Gardner's saltbush | Perennial herb | 2 |
| Atriplex gardneri var. falcata | Sickle saltbush | Perennial herb | 1 |
| Balsamorhiza deltoidea | Deltoid balsam root | Perennial herb | 2 |
| Balsamorhiza hookeri | Hooker's balsam root | Perennial herb | 1 |
| Balsamorhiza hookeri var. lanata | Woolly balsamroot | Perennial herb | |
| Balsamorhiza lanata | Woolly balsamroot | Perennial herb | |
| Balsamorhiza macrolepis | Big scale balsam root | Perennial herb | 1 |
| Balsamorhiza macrolepis var. platylepis | Flat scale balsam root | Perennial herb | 1 |
| Balsamorhiza sagittata | Arrow leaved balsamroot | Perennial herb | 6 |
| Balsamorhiza serrata | Serrate balsam root | Perennial herb | |
| Barbarea orthoceras | Winter cress | Perennial herb | 1 |
| Berula erecta | Cut leaved water parsnip | Perennial herb | 1 |
| Bidens cernua | Nodding beggartick | Perennial herb | |
| Bidens cernua var. cernua | Nodding bur marigold | Perennial herb | |
| Bidens laevis | Bur marigold | Perennial herb | 4 |
| Bistorta bistortoides | American bistort | Perennial herb | |
| Boechera arcuata | Arching rockcress | Perennial herb | |
| Boechera calderi | Calder's rockcress | Perennial herb | |
| Boechera californica | California rockcress | Perennial herb | 1 |
| Boechera cobrensis | Masonic rock cress | Perennial herb | |
| Boechera davidsonii | Davidson's rockcress | Perennial herb | |
| Boechera divaricarpa | Spreadingpod rockcress | Perennial herb | |
| Boechera elkoensis | Elko rockcress | Perennial herb | |
| Boechera lemmonii | Lemmon's rockcress | Perennial herb | |
| Boechera lyallii | Lyall's rockcress | Perennial herb | 1 |
| Boechera microphylla | Small-leaved rock cress | Perennial herb | |
| Boechera microphylla var. microphylla | Small-leaved rock cress | Perennial herb | |
| Boechera pauciflora | Hairy stem rockcress | Perennial herb | |
| Boechera paupercula | Small-flowered rockcress | Perennial herb | |
| Boechera pinetorum | Woodland rockcress | Perennial herb | |
| Boechera platysperma | Pioneer rockcress | Perennial herb | |
| Boechera puberula | Silver rockcress | Perennial herb | |
| Boechera retrofracta | Reflexed rockcress | Perennial herb | |
| Boechera sparsiflora | Sicklepod rockcress | Perennial herb | 2 |
| Boechera stricta | Drummond's rockcress | Perennial herb | |
| Boechera subpinnatifida | Klamath rockcress | Perennial herb | |
| Boechera suffrutescens | Woody rockcress | Perennial herb | |
| Bolboschoenus fluviatilis | River bulrush | Perennial grass | 2 |
| Bolboschoenus maritimus | Alkali bulrush | Perennial grass | 16 |
| Bolboschoenus maritimus ssp. paludosus | Saltmarsh bulrush | Perennial grass | 16 |
| Boykinia major | Large boykinia | Perennial herb | 5 |
| Brickellia grandiflora | Large flowered brickelbush | Perennial herb | |
| Brodiaea coronaria | Harvest brodiaea | Perennial herb (bulb) | 3 |
| Brodiaea coronaria ssp. coronaria | Harvest brodiaea | Perennial herb (bulb) | 3 |
| Brodiaea coronaria ssp. rosea | Indian valley brodiaea | Perennial herb (bulb) | |
| Brodiaea elegans | Harvest brodiaea | Perennial herb | 6 |
| Brodiaea elegans ssp. elegans | Harvest brodiaea | Perennial herb | 1 |
| Brodiaea rosea | Indian valley brodiaea | Perennial herb (bulb) | |
| Brodiaea rosea ssp. rosea | Indian Valley brodiaea | Perennial herb (bulb | |
| Bromus carinatus | California bromegrass | Perennial grass | 19 |
| Bromus carinatus var. carinatus | California brome | Perennial grass | 19 |
| Bromus carinatus var. marginatus | Mountain brome | Perennial grass | 6 |
| Bromus laevipes | Narrow flowered brome | Perennial grass | 3 |
| Bromus marginatus | Mountain brome | Perennial grass | 6 |
| Bromus sitchensis var. carinatus | California brome | Perennial grass | 19 |
| Bromus sitchensis var. marginatus | Mountain brome | Perennial grass | 6 |
| Bromus suksdorfii | Suksdorf's bromegrass | Perennial grass | 1 |
| Calamagrostis canadensis | Canada reedgrass | Perennial grass | 5 |
| Calamagrostis canadensis var. langsdorfii | Canada reedgrass | Perennial grass | |
| Callitriche fassettii | Fassett's water starwort | Perennial herb | |
| Callitriche hermaphroditica | Northern water starwort | Perennial herb | |
| Callitriche heterophylla | Water starwort | Perennial herb | |
| Calochortus bruneaunis | Pinyon mariposa | Perennial herb | 1 |
| Calochortus leichtlinii | Leichtlin's mariposa lily | Perennial herb | 2 |
| Calochortus longebarbatus | Longbeard mariposa lily | Perennial herb (bulb) | 1 |
| Calochortus longebarbatus var. longebarbatus | Long haired star tulip | Perennial herb (bulb) | |
| Calochortus macrocarpus | Sagebrush mariposa lily | Perennial herb | |
| Calochortus tolmiei | Hairy star tulip | Perennial herb | 5 |
| Caltha leptosepala | White marsh marigold | Perennial herb | 3 |
| Calyptridium monospermum | One seeded pussypaws | Perennial herb | |
| Calystegia occidentalis | Bush morning glory | Perennial herb | 2 |
| Calystegia occidentalis ssp. occidentalis | Modoc morning glory | Perennial herb | |
| Calystegia occidentalis var. tomentella | Kern morning glory | Perennial herb | |
| Camassia leichtlinii | Large camas | Perennial herb | 11 |
| Camassia leichtlinii ssp. suksdorfii | Suksdorf's large camas | Perennial herb | 3 |
| Camassia quamash | Camas | Perennial herb | 13 |
| Camassia quamash ssp. breviflora | Small camas | Perennial herb | 1 |
| Camassia quamash ssp. quamash | Common camas | Perennial herb | 3 |
| Camissonia subacaulis | Long leaved suncup | Perennial herb | |
| Camissonia tanacetifolia | Tansy leaf evening primrose | Perennial herb | |
| Camissonia tanacetifolia ssp. quadriperforata | Sierra valley evening primrose | Perennial herb | |
| Camissonia tanacetifolia ssp. tanacetifolia | Tansy leaved suncup | Perennial herb | |
| Campanula scabrella | Rough harebell | Perennial herb (rhizomatous) | |
| Cardamine breweri | Brewer's bitter cress | Perennial herb | |
| Cardamine breweri var. breweri | Brewer's bitter cress | Perennial herb | |
| Cardamine cordifolia | Heartleaf bittercress | Perennial herb | |
| Cardamine pensylvanica | Pennsylvania bittercress | Perennial herb | |
| Carex abrupta | Abrupt beaked sedge | Perennial grass | |
| Carex amplectens | Clasping bract sedge | Perennial grass | 1 |
| Carex amplifolia | Ample leaved sedge | Perennial grass | 3 |
| Carex angustata | Narrow leaved sedge | Perennial grass | 1 |
| Carex aquatilis | Water sedge | Perennial grass | 5 |
| Carex aquatilis var. aquatilis | Water sedge | Perennial grass | 1 |
| Carex atherodes | Slough sedge | Perennial grass | |
| Carex athrostachya | Slender leaved sedge | Perennial grass | 3 |
| Carex aurea | Golden fruited sedge | Perennial grass | |
| Carex bella | Southwestern showy sedge | Perennial grass | |
| Carex bolanderi | Bolander's sedge | Perennial grass | |
| Carex capitata | Capitate sedge | Perennial grass | |
| Carex comosa | Bristly sedge | Perennial grass (rhizomatous) | 2 |
| Carex densa | Sedge | Perennial grass | 8 |
| Carex deweyana | Dewey sedge | Perennial grass | 5 |
| Carex deweyana ssp. leptopoda | Dewey's taper fruit sedge | Perennial grass | 3 |
| Carex diandra | Lesser panicled sedge | Perennial grass | 1 |
| Carex disperma | Soft leaf sedge | Perennial grass | |
| Carex douglasii | Douglas sedge | Perennial grass | 1 |
| Carex dudleyi | Dudley's sedge | Perennial grass | 8 |
| Carex feta | Green sheathed sedge | Perennial grass | |
| Carex filifolia | Thread leaf sedge | Perennial grass | 1 |
| Carex filifolia var. erostrata | Thread leaf sedge | Perennial grass | |
| Carex fracta | Fragile sheathed sedge | Perennial grass | 1 |
| Carex garberi | Garber's sedge | Perennial grass | |
| Carex geyeri | Geyer's sedge | Perennial grass (rhizomatous) | |
| Carex halliana | Hall's sedge | Perennial grass (rhizomatous) | |
| Carex hassei | Hasse's sedge | Perennial grass | |
| Carex haydeniana | Cloud sedge | Perennial grass | |
| Carex heteroneura | Variable nerved sedge | Perennial grass | |
| Carex hoodii | Hood's sedge | Perennial grass | |
| Carex illota | Sheep sedge | Perennial grass | |
| Carex inops | Long stolon sedge | Perennial grass | 1 |
| Carex inops ssp. inops | Long stolon sedge | Perennial grass | 2 |
| Carex integra | Smooth beak sedge | Perennial grass | |
| Carex jonesii | Jones' sedge | Perennial grass | |
| Carex lasiocarpa | Woolly fruited sedge | Perennial grass (rhizomatous) | 2 |
| Carex lenticularis | Lakeshore sedge | Perennial grass | 1 |
| Carex lenticularis var. impressa | Lakeshore sedge | Perennial grass | |
| Carex lenticularis var. lipocarpa | Fat fruited sedge | Perennial grass | 1 |
| Carex leptopoda | Slender-footed sedge | Perennial grass | 5 |
| Carex limosa | Shore sedge | Perennial grass (rhizomatous) | |
| Carex luzulifolia | Littleleaf sedge | Perennial grass | |
| Carex luzulina | Wood rush sedge | Perennial grass | |
| Carex luzulina var. ablata | American cold loving sedge | Perennial grass | |
| Carex mariposana | Mariposa sedge | Perennial grass | |
| Carex microptera | Small wing sedge | Perennial grass | 2 |
| Carex multicaulis | Forest sedge | Perennial grass | |
| Carex nebrascensis | Nebraska sedge | Perennial grass | 2 |
| Carex pachycarpa | Furrowed broomsedge | Perennial grass | |
| Carex pachystachya | Thick headed sedge | Perennial grass | 2 |
| Carex pellita | Woolly sedge | Perennial grass | 7 |
| Carex petasata | Liddon's sedge | Perennial grass | |
| Carex phaeocephala | Mountain hare sedge | Perennial grass | |
| Carex praegracilis | Field sedge | Perennial grass | 28 |
| Carex raynoldsii | Raynold's sedge | Perennial grass | |
| Carex rossii | Ross' sedge | Perennial grass | 1 |
| Carex scopulorum | Mountain sedge | Perennial grass | |
| Carex scopulorum var. bracteosa | Bracted sedge | Perennial grass | |
| Carex sheldonii | Sheldon's sedge | Perennial grass (rhizomatous) | |
| Carex simulata | Short beaked sedge | Perennial grass | 2 |
| Carex specifica | Narrow fruit sedge | Perennial grass | |
| Carex spectabilis | Showy sedge | Perennial grass | 2 |
| Carex straminiformis | Straw like sedge | Perennial grass | |
| Carex subfusca | Brown sedge | Perennial grass | 8 |
| Carex tumulicola | Split awn sedge | Perennial grass | 26 |
| Carex utriculata | Beaked sedge | Perennial grass | 7 |
| Carex vallicola | Valley sedge | Perennial grass | |
| Carex vernacula | Native sedge | Perennial grass | |
| Carex vesicaria | Blister sedge | Perennial grass | 3 |
| Carex vesicaria var. vesicaria | Inflated sedge | Perennial grass | 2 |
| Carex whitneyi | Whitney's sedge | Perennial grass | |
| Castilleja angustifolia | Desert paintbrush | Perennial herb | 3 |
| Castilleja applegatei | Wavy leaf paintbrush | Perennial herb | 2 |
| Castilleja applegatei ssp. pallida | Brewer's indian paintbrush | Perennial herb | |
| Castilleja applegatei ssp. pinetorum | Pine wavy leaf paintbrush | Perennial herb | |
| Castilleja arachnoidea | Cobwebby paintbrush | Perennial herb | |
| Castilleja chromosa | Desert paintbrush | Perennial herb | 3 |
| Castilleja linariifolia | Desert paintbursh | Perennial herb | 2 |
| Castilleja miniata | Great red paintbrush | Perennial herb | 6 |
| Castilleja pilosa | Pilose paintbrush | Perennial herb | |
| Castilleja pruinosa | Frosted paintbrush | Perennial herb (hemiparasitic) | |
| Caulanthus crassicaulis | Thick stemmed caulanthus | Perennial herb | |
| Ceratophyllum demersum | Hornwort | Perennial herb | 1 |
| Chaenactis nevadensis | Sierra chaenactis | Perennial herb | |
| Chamaesaracha nana | Dwarf chamaesaracha | Perennial herb | |
| Chamerion angustifolium | Fireweed | Perennial herb | 14 |
| Chamerion angustifolium ssp. circumvagum | Fireweed | Perennial herb | 2 |
| Chimaphila menziesii | Little prince's pine | Perennial herb | |
| Chimaphila umbellata | Blake's prince's pine | Perennial herb | |
| Cicuta douglasii | Western water hemlock | Perennial herb | 1 |
| Cicuta maculata | Water hemlock | Perennial herb | 1 |
| Cicuta maculata var. angustifolia | Narrow leafed water hemlock | Perennial herb | |
| Circaea alpina | Small enchanter's nightshade | Perennial herb | |
| Circaea alpina ssp. pacifica | Pacific enchanter's nightshade | Perennial herb | |
| Cirsium andersonii | Anderson's thistle | Perennial herb | |
| Cirsium canovirens | Gray green thistle | Perennial herb | |
| Cirsium congdonii | Congdon's thistle | Perennial herb | |
| Cirsium cymosum | Peregrine thistle | Perennial herb | |
| Cirsium cymosum var. canovirens | Gray-green thistle | Perennial herb | |
| Cirsium cymosum var. cymosum | Peregrine thistle | Perennial herb | |
| Cirsium douglasii | Swamp thistle | Perennial herb | 1 |
| Cirsium douglasii var. breweri | Brewer's swamp thistle | Perennial herb | |
| Cirsium inamoenum var. inamoenum | Greene's thistle | Perennial herb | |
| Cirsium neomexicanum | Desert thistle | Perennial herb | |
| Cirsium occidentale | Western thistle | Perennial herb | 9 |
| Cirsium occidentale var. candidissimum | Snowy thistle | Perennial herb | |
| Cirsium scariosum | Elk thistle | Perennial herb | |
| Cirsium scariosum var. americanum | Dinnerplate thistle | Perennial herb | |
| Cirsium scariosum var. robustum | Elk thistle | Perennial herb | |
| Claytonia lanceolata | Western spring beauty | Perennial herb | |
| Claytonia megarhiza | Fell fields claytonia | Perennial herb | |
| Claytonia nevadensis | Sierra spring beauty | Perennial herb | 1 |
| Collomia tenella | Slender collomia | Perennial herb | |
| Comandra umbellata | Bastard toadflax | Perennial herb (parasitic) | |
| Comandra umbellata ssp. californica | Bastard toadflax | Perennial herb (parasitic) | |
| Comarum palustre | Marsh cinquefoil | Perennial herb | 5 |
| Corallorhiza maculata | Summer coral root | Perennial herb | |
| Corallorhiza striata | Striped coral root | Perennial herb | |
| Corallorhiza striata var. striata | Hooded coralroot | Perennial herb | |
| Crepis acuminata | Tall hawksbeard | Perennial herb | |
| Crepis bakeri | Baker's hawksbeard | Perennial herb | |
| Crepis bakeri ssp. bakeri | Baker's hawksbeard | Perennial herb | |
| Crepis bakeri ssp. cusickii | Cusick's hawksbeard | Perennial herb | |
| Crepis intermedia | Intermediate hawksbeard | Perennial herb | |
| Crepis modocensis | Modoc hawksbeard | Perennial herb | |
| Crepis modocensis ssp. modocensis | Modoc hawksbeard | Perennial herb | |
| Crepis modocensis ssp. subacaulis | Modoc hawksbeard | Perennial herb | |
| Crepis occidentalis | Western hawk's beard | Perennial herb | |
| Crepis occidentalis ssp. conjuncta | Largeflower hawksbeard | Perennial herb | |
| Crepis occidentalis ssp. costata | Largeflower hawksbeard | Perennial herb | |
| Crepis occidentalis ssp. occidentalis | Largeflower hawksbeard | Perennial herb | |
| Crepis occidentalis ssp. pumila | Largeflower hawksbeard | Perennial herb | |
| Crepis pleurocarpa | Naked stemmed hawksbeard | Perennial herb | |
| Crepis runcinata | Meadow hawksbeard | Perennial herb | |
| Cressa truxillensis | Alkali weed | Perennial herb | 3 |
| Cryptantha celosioides | Cocks comb cat's eye | Perennial herb | |
| Cryptantha humilis | Low oreocarya | Perennial herb | |
| Cryptantha schoolcraftii | Schoolcraft's cryptantha | Perennial herb | |
| Cryptantha sobolifera | Sierra perennial cryptantha | Perennial herb | |
| Cusickiella douglasii | Alkali draba | Perennial herb | |
| Cymopterus terebinthinus | Turpentine cymopterus | Perennial herb | |
| Cymopterus terebinthinus var. californicus | Turpentine cymopterus | Perennial herb | |
| Cynoglossum occidentale | Hound's tongue | Perennial herb | |
| Cypripedium californicum | California lady's slipper | Perennial herb (rhizomatous) | |
| Cypripedium fasciculatum | Clustered lady's slipper | Perennial herb (rhizomatous) | |
| Cypripedium montanum | Mountain lady's slipper | Perennial herb (rhizomatous) | |
| Damasonium californicum | California damsonium | Perennial herb (aquatic) | |
| Danthonia californica | California oatgrass | Perennial grass | 21 |
| Danthonia californica var. americana | American oatgrass | Perennial grass | 21 |
| Danthonia californica var. californica | California oatgrass | Perennial grass | 21 |
| Danthonia intermedia | Timber oatgrass | Perennial grass | 2 |
| Danthonia unispicata | One spiked oatgrass | Perennial grass | |
| Delphinium andersonii | Anderson larkspur | Perennial herb | 4 |
| Delphinium depauperatum | Few flowered larkspur | Perennial herb | |
| Delphinium nudicaule | Canyon larkspur | Perennial herb | 3 |
| Delphinium nuttallianum | Nuttall's larkspur | Perennial herb | 2 |
| Delphinium stachydeum | Spiked larkspur | Perennial herb | |
| Deschampsia cespitosa | Tufted hair grass | Perennial grass | 49 |
| Deschampsia cespitosa ssp. cespitosa | Tufted hairgrass | Perennial grass | 24 |
| Deschampsia elongata | Hairgrass | Perennial grass | 17 |
| Descurainia incana | Mountain tansy mustard | Perennial herb | |
| Dicentra uniflora | Steers head | Perennial herb | |
| Dichelostemma capitatum | Blue dicks | Perennial herb | 15 |
| Dichelostemma capitatum ssp. capitatum | Wild hyacinth | Perennial herb | 2 |
| Dichelostemma congestum | Fork toothed ookow | Perennial herb | 7 |
| Dichelostemma multiflorum | Many flowered brodiaea | Perennial herb | 6 |
| Dieteria canescens | Hoary aster | Perennial herb | 1 |
| Dieteria canescens var. canescens | Hoary aster | Perennial herb | |
| Dieteria canescens var. shastensis | Shasta aster | Perennial herb | |
| Dipterostemon capitatus | Blue dicks | Perennial herb | 15 |
| Dipterostemon capitatus ssp. capitatus | Perennial herb | 2 | |
| Distichlis spicata | Salt grass | Perennial grass | 25 |
| Dodecatheon alpinum | Alpine shooting star | Perennial herb | 1 |
| Dodecatheon conjugens | Bonneville shooting star | Perennial herb | |
| Dodecatheon hendersonii | Shooting star | Perennial herb | 11 |
| Dodecatheon pulchellum | Dark throated shooting star | Perennial herb | 6 |
| Draba densifolia | Dense leaved draba | Perennial herb | |
| Draba lonchocarpa | Lancepod draba | Perennial herb | |
| Draba lonchocarpa var. lonchocarpa | Spear fruited draba | Perennial herb | |
| Draba novolympica | Trelease's draba | Perennial herb | |
| Draba paysonii | Payson's draba | Perennial herb | |
| Draba paysonii var. treleasei | Trelease's draba | Perennial herb | |
| Drosera anglica | Long leaved sundew | Perennial herb (carnivorous) | |
| Drymocallis glandulosa | Sticky cinquefoil | Perennial herb | 11 |
| Drymocallis glandulosa var. glandulosa | Sticky cinquefoil | Perennial herb | |
| Drymocallis glandulosa var. reflexa | Sticky cinquefoil | Perennial herb | |
| Drymocallis lactea | Perennial herb | 1 | |
| Drymocallis lactea var. austiniae | Austin's woodbeauty | Perennial herb | |
| Drymocallis lactea var. lactea | Sierran woodbeauty | Perennial herb | |
| Drymocallis pseudorupestris | False rock loving cinquefoil | Perennial herb | 1 |
| Drymocallis pseudorupestris var. saxicola | Cliff woodbeauty | Perennial herb | |
| Dugaldia hoopesii | Hoope's sneezeweed | Perennial herb | 7 |
| Eleocharis acicularis | Needle spikerush | Perennial grass | 2 |
| Eleocharis acicularis var. acicularis | Needle spike rush | Perennial grass | |
| Eleocharis acicularis var. bella | Beautiful spikerush | Perennial grass | |
| Eleocharis bella | Beautiful spikerush | Perennial grass | |
| Eleocharis bolanderi | Bolander's spikerush | Perennial grass | |
| Eleocharis coloradoensis | Dwarf spikerush | Perennial grass | 2 |
| Eleocharis macrostachya | Spike rush | Perennial grass | 19 |
| Eleocharis montevidensis | Montevideo spike rush | Perennial grass | 2 |
| Eleocharis palustris | Common spikerush | Perennial grass | 8 |
| Eleocharis parishii | Parish's spike rush | Perennial grass | |
| Eleocharis pauciflora | Few flowered spike rush | Perennial grass | |
| Eleocharis quinqueflora | Fewflower spikerush | Perennial grass | |
| Eleocharis rostellata | Walking sedge | Perennial grass | 1 |
| Eleocharis suksdorfiana | Suksdorf's spikerush | Perennial grass | |
| Elodea canadensis | Common water weed | Perennial herb | |
| Elodea nuttallii | Western waterweed | Perennial herb | |
| Elymus Xhansenii | Perennial grass | ||
| Elymus Xsaundersii | Perennial grass | ||
| Elymus cinereus | Great basin wild rye | Perennial grass | 8 |
| Elymus condensatus | Giant wild rye | Perennial grass | 31 |
| Elymus elymoides | Squirrel tail grass | Perennial grass | 14 |
| Elymus elymoides ssp. californicus | California squirreltail | Perennial grass | |
| Elymus elymoides ssp. elymoides | Squirreltail | Perennial grass | |
| Elymus elymoides ssp. hordeoides | Barley squirreltail | Perennial grass | |
| Elymus elymoides var. californicus | Squirrel tail grass | Perennial grass | |
| Elymus elymoides var. elymoides | Squirrel tail grass | Perennial grass | |
| Elymus glaucus | Blue wildrye | Perennial grass | 32 |
| Elymus glaucus ssp. glaucus | Blue wild rye | Perennial grass | 1 |
| Elymus glaucus ssp. jepsonii | Western rye grass | Perennial grass | 1 |
| Elymus lanceolatus | Thickspike wheatgrass | Perennial grass | 3 |
| Elymus lanceolatus ssp. lanceolatus | Northern wheatgrass | Perennial grass | 4 |
| Elymus multisetus | Big squirreltail grass | Perennial grass | 12 |
| Elymus smithii | Western wheat grass | Perennial grass | 6 |
| Elymus spicatus | Blue bunch wheat grass | Perennial grass | 7 |
| Elymus trachycaulus | Slender wheatgrass | Perennial grass | 8 |
| Elymus trachycaulus ssp. subsecundus | Bearded wheatgrass | Perennial grass | 2 |
| Elymus trachycaulus ssp. trachycaulus | Slender wheatgrass | Perennial grass | 7 |
| Elymus triticoides | Beardless wild rye | Perennial grass | 29 |
| Enemion stipitatum | Siskiyou false rue anemone | Perennial herb | |
| Epilobium anagallidifolium | Alpine willowherb | Perennial herb | |
| Epilobium angustifolium ssp. angustifolium | Fireweed | Perennial herb | 2 |
| Epilobium angustifolium ssp. circumvagum | Fireweed | Perennial herb | 1 |
| Epilobium ciliatum | Slender willow herb | Perennial herb | 2 |
| Epilobium ciliatum ssp. ciliatum | Willow herb | Perennial herb | 2 |
| Epilobium ciliatum ssp. glandulosum | Glandular willowherb | Perennial herb | 1 |
| Epilobium clavatum | Club fruit willowherb | Perennial herb | |
| Epilobium glaberrimum | Smooth willowherb | Perennial herb | |
| Epilobium glaberrimum ssp. fastigiatum | Smooth willowherb | Perennial herb | |
| Epilobium glaberrimum ssp. glaberrimum | Smooth willowherb | Perennial herb | |
| Epilobium halleanum | Hairy willowherb | Perennial herb | |
| Epilobium hallianum | Hall's willowherb | Perennial herb | |
| Epilobium hornemannii | Hornemann's willowherb | Perennial herb | |
| Epilobium hornemannii ssp. hornemannii | Hornemann's willow herb | Perennial herb | |
| Epilobium obcordatum | Heart willowweed | Perennial herb | |
| Epilobium oregonense | Slimstem willowweed | Perennial herb | |
| Epilobium saximontanum | Glandular willowherb | Perennial herb | |
| Epipactis gigantea | Stream orchid | Perennial herb | 16 |
| Eremogone aculeata | Prickly sandwort | Perennial herb | |
| Eremogone congesta | Capitate sandwort | Perennial herb | |
| Eremogone congesta var. congesta | Capitate sandwort | Perennial herb | |
| Eremogone congesta var. crassula | Rough sandwort | Perennial herb | |
| Eremogone congesta var. simulans | Capitate sandwort | Perennial herb | |
| Eremogone congesta var. subcongesta | Capitate sandwort | Perennial herb | |
| Eremogone congesta var. suffrutescens | Suffrutescent sandwort | Perennial herb | |
| Eremogone kingii | King's sandwort | Perennial herb | 1 |
| Eremogone kingii var. glabrescens | King's smooth sandwort | Perennial herb | |
| Erigeron aphanactis | Rayless shaggy fleabane | Perennial herb | |
| Erigeron aphanactis var. aphanactis | Rayless shaggy fleabane | Perennial herb | |
| Erigeron austiniae | Rebecca austin's fleabane | Perennial herb | |
| Erigeron bloomeri | Scabland fleabane | Perennial herb | |
| Erigeron bloomeri var. bloomeri | Scabland fleabane | Perennial herb | |
| Erigeron breweri | Brewer's fleabane | Perennial herb | |
| Erigeron breweri var. klamathensis | Klamath fleabane | Perennial herb | |
| Erigeron chrysopsidis | Dwarf yellow fleabane | Perennial herb | 1 |
| Erigeron chrysopsidis var. austiniae | Rebecca austin's fleabane | Perennial herb | |
| Erigeron compositus | Cut leaved daisy | Perennial herb | 4 |
| Erigeron coulteri | Coulter's daisy | Perennial herb | |
| Erigeron eatonii | Eaton's daisy | Perennial herb | |
| Erigeron eatonii var. plantagineus | Eaton's daisy | Perennial herb | |
| Erigeron elegantulus | Volcanic daisy | Perennial herb | |
| Erigeron filifolius | Threadleaf fleabane | Perennial herb | |
| Erigeron filifolius var. filifolius | Thread leaved fleabane | Perennial herb | |
| Erigeron glacialis | Wandering fleabane | Perennial herb | 3 |
| Erigeron glacialis var. glacialis | Wandering fleabane | Perennial herb | |
| Erigeron glacialis var. hirsutus | Wandering fleabane | Perennial herb | |
| Erigeron inornatus | Rayless fleabane | Perennial herb | |
| Erigeron inornatus var. inornatus | Fleabane | Perennial herb | |
| Erigeron klamathensis | Klamath fleabane | Perennial herb | |
| Erigeron lassenianus | Mt. lassen fleabane | Perennial herb | |
| Erigeron lassenianus var. lassenianus | Mt. lassen daisy | Perennial herb | |
| Erigeron linearis | Narrow leaved fleabane | Perennial herb | 3 |
| Erigeron lobatus | Lobed fleabane | Perennial herb | 4 |
| Erigeron lonchophyllus | Shortray fleabane | Perennial herb | |
| Erigeron peregrinus | Wandering fleabane | Perennial herb | 3 |
| Erigeron peregrinus var. callianthemus | Wandering fleabane | Perennial herb | |
| Erigeron peregrinus var. hirsutus | Wandering fleabane | Perennial herb | |
| Erigeron philadelphicus | Philadelphia fleabane | Perennial herb | |
| Erigeron philadelphicus var. philadelphicus | Philadelphia fleabane | Perennial herb | |
| Erigeron pumilus | Shaggy fleabane | Perennial herb | |
| Erigeron pumilus ssp. intermedius | Shaggy fleabane | Perennial herb | |
| Erigeron pumilus var. gracilior | Shaggy fleabane | Perennial herb | |
| Erigeron pumilus var. intermedius | Shaggy fleabane | Perennial herb | |
| Erigeron tener | Slender fleabane | Perennial herb | |
| Eriogonum caespitosum | Clumping buckwheat | Perennial herb | 3 |
| Eriogonum douglasii | Douglas' buckwheat | Perennial herb | 1 |
| Eriogonum douglasii var. douglasii | Douglas' buckwheat | Perennial herb | |
| Eriogonum douglasii var. meridionale | Douglas' buckwheat | Perennial herb | 1 |
| Eriogonum elatum | Tall buckwheat | Perennial herb | |
| Eriogonum elatum var. elatum | Tall buckwheat | Perennial herb | |
| Eriogonum elatum var. villosum | Long hairy tall buckwheat | Perennial herb | |
| Eriogonum heracleoides | Parsnipflower buckwheat | Perennial herb | 4 |
| Eriogonum heracleoides var. heracleoides | Parsnip flowered buckwheat | Perennial herb | 1 |
| Eriogonum microtheca | Slender buckwheat | Perennial herb | |
| Eriogonum microtheca var. ambiguum | Yellow-flowered wild buckwheat | Perennial herb | |
| Eriogonum microtheca var. laxiflorum | Great basin wild buckwheat | Perennial herb | |
| Eriogonum ovalifolium | Oval leaved eriogonum | Perennial herb | 4 |
| Eriogonum ovalifolium var. nivale | Cushion buckwheat | Perennial herb | 1 |
| Eriogonum ovalifolium var. ovalifolium | Cushion buckwheat | Perennial herb | |
| Eriogonum ovalifolium var. purpureum | Purple cushion buckwheat | Perennial herb | |
| Eriogonum prociduum | Prostrate buckwheat | Perennial herb | |
| Eriogonum sphaerocephalum | Round headed buckwheat | Perennial herb | |
| Eriogonum sphaerocephalum var. halimioides | Round headed buckwheat | Perennial herb | |
| Eriogonum sphaerocephalum var. sphaerocephalum | Round headed buckwheat | Perennial herb | |
| Eriogonum strictum | Blue mountain buckwheat | Perennial herb | 1 |
| Eriogonum strictum var. anserinum | Blue mountain buckwheat | Perennial herb | |
| Eriogonum umbellatum | Sulphur buckwheat | Perennial herb | 26 |
| Eriogonum umbellatum var. dichrocephalum | Sulphur buckwheat | Perennial herb | |
| Eriogonum umbellatum var. dumosum | Many flowered sulfur flower | Perennial herb | 3 |
| Eriogonum umbellatum var. furcosum | Desert sulfur buckwheat | Perennial herb | |
| Eriogonum umbellatum var. glaberrimum | Green buckwheat | Perennial herb | |
| Eriogonum umbellatum var. modocense | Sulphur flower buckwheat | Perennial herb | 2 |
| Eriogonum umbellatum var. nevadense | Sierra sulfur flower | Perennial herb | 2 |
| Eriogonum umbellatum var. polyanthum | Many flowered sulfur flower | Perennial herb | 6 |
| Eriophorum gracile | Slender cotton grass | Perennial grass | |
| Eriophyllum lanatum | Wooly sunflower | Perennial herb | 27 |
| Eriophyllum lanatum var. achillaeoides | Yarrow leaved woolly sunflower | Perennial herb | 2 |
| Eriophyllum lanatum var. achilleoides | Yarrow leaved woolly sunflower | Perennial herb | 2 |
| Eriophyllum lanatum var. integrifolium | Oregon sunshine | Perennial herb | |
| Eryngium alismifolium | Coyote thistle | Perennial herb | |
| Eryngium articulatum | Coyote thistle | Perennial herb | 1 |
| Eryngium mathiasiae | Mathias' button celery | Perennial herb | |
| Erysimum argillosum | Western wallflower | Perennial herb | |
| Erysimum capitatum | Wallflower | Perennial herb | 10 |
| Erysimum capitatum var. angustatum | Contra costa wallflower | Perennial herb | 1 |
| Erysimum capitatum var. bealianum | Western wallflower | Perennial herb | 1 |
| Erysimum capitatum var. capitatum | Sanddune wallflower | Perennial herb | 1 |
| Erysimum capitatum var. lompocense | San luis obispo wallflower | Perennial herb | 1 |
| Erysimum capitatum var. perenne | Sanddune wallflower | Perennial herb | |
| Erysimum capitatum var. purshii | Pursh's wallflower | Perennial herb | |
| Erysimum perenne | Sanddune wallflower | Perennial herb | |
| Erythranthe lewisii | Lewis' monkey flower | Perennial herb | 12 |
| Erythranthe linearifolia | Primrose monkeyflower | Perennial herb | 3 |
| Erythranthe moschata | Musk monkeyflower | Perennial herb | 1 |
| Erythranthe nasuta | Perennial herb | ||
| Erythranthe primuloides | Primrose monkeyflower | Perennial herb | |
| Erythranthe tilingii | Larger mountain monkeyflower | Perennial herb | 3 |
| Eschscholzia californica ssp. californica | California poppy | Perennial herb | 3 |
| Eschscholzia procera | Kernville poppy | Perennial herb | 3 |
| Eurybia integrifolia | Thickstem aster | Perennial herb | |
| Euthamia occidentalis | Western goldenrod | Perennial herb | 15 |
| Festuca brachyphylla | Alpine fescue | Perennial grass | 2 |
| Festuca brachyphylla ssp. breviculmis | Short leaved fescue | Perennial grass | 1 |
| Festuca brachyphylla ssp. coloradensis | Colorado fescue | Perennial grass | |
| Festuca californica | California fescue | Perennial grass | 48 |
| Festuca idahoensis | Blue fescue | Perennial grass | 53 |
| Festuca kingii | Spike fescue | Perennial grass | |
| Festuca occidentalis | Western fescue | Perennial grass | 8 |
| Festuca roemeri var. klamathensis | Idaho fescue | Perennial grass | 48 |
| Festuca rubra | Red fescue | Perennial grass | 39 |
| Festuca viridula | Mountain bunch fescue | Perennial grass | |
| Fragaria crinita | Beach strawberry | Perennial herb | 35 |
| Fragaria vesca | Wild strawberry | Perennial herb | 36 |
| Fragaria virginiana | Mountain strawberry | Perennial herb | 12 |
| Frasera albicaulis | Whitestem frasera | Perennial herb | |
| Frasera albicaulis var. modocensis | Modoc frasera | Perennial herb | |
| Frasera albicaulis var. nitida | Whitestem frasera | Perennial herb | |
| Frasera speciosa | Monument plant | Perennial herb | |
| Fritillaria atropurpurea | Spotted mountain bells | Perennial herb | 2 |
| Fritillaria pinetorum | Pine woods fritillary | Perennial herb | |
| Fritillaria pudica | Yellow fritillary | Perennial herb | 4 |
| Fritillaria recurva | Scarlet fritillary | Perennial herb | 1 |
| Galium bolanderi | Bolander's bedstraw | Perennial herb | |
| Galium glabrescens | Castle lake bedstraw | Perennial herb | |
| Galium glabrescens ssp. glabrescens | Castle lake bedstraw | Perennial herb | |
| Galium glabrescens ssp. modocense | Modoc bedstraw | Perennial herb | |
| Galium grayanum | Gray's bedstraw | Perennial herb | |
| Galium grayanum var. nanum | Gray's bedstraw | Perennial herb | |
| Galium mexicanum | Mexican bedstraw | Perennial herb | |
| Galium mexicanum ssp. asperulum | Mexican bedstraw | Perennial herb | |
| Galium mexicanum var. asperulum | Mexican bedstraw | Perennial herb | |
| Galium multiflorum | Many flowered bedstraw | Perennial herb | |
| Galium serpenticum | Northern bedstraw | Perennial herb | |
| Galium serpenticum ssp. scotticum | Scott mtn. bedstraw | Perennial herb | |
| Galium serpenticum ssp. warnerense | Warner mtns. bedstraw | Perennial herb (rhizomatous) | |
| Galium trifidum | Three petaled bedstraw | Perennial herb | |
| Galium trifidum ssp. columbianum | Threepetal bedstraw | Perennial herb | |
| Galium trifidum ssp. subbiflorum | Threepetal bedstraw | Perennial herb | |
| Galium trifidum var. pacificum | Bedstraw | Perennial herb | |
| Galium trifidum var. pusillum | Small bedstraw | Perennial herb | |
| Gentiana affinis | Pleated gentian | Perennial herb | 1 |
| Gentiana affinis var. ovata | Gentian | Perennial herb | 1 |
| Gentiana affinis var. parvidentata | Small toothed prairie gentian | Perennial herb | 1 |
| Geranium oreganum | Oregon geranium | Perennial herb | 2 |
| Geranium richardsonii | Richardson's geranium | Perennial herb | |
| Geranium viscosissimum | Sticky geranium | Perennial herb | 2 |
| Geum aleppicum | Aleppo avens | Perennial herb | |
| Geum macrophyllum | Large leaved avens | Perennial herb | 8 |
| Geum triflorum | Old man's beard | Perennial herb | 7 |
| Geum triflorum var. ciliatum | Prairie-smoke | Perennial herb | 1 |
| Glaux maritima | Sea milk wort | Perennial herb | |
| Glyceria borealis | Northern mannagrass | Perennial grass | 1 |
| Glyceria elata | Tall mannagrass | Perennial grass | 8 |
| Glyceria striata | Fowl mannagrass | Perennial grass | 8 |
| Gnaphalium canescens ssp. thermale | Small headed cudweed | Perennial herb | |
| Goodyera oblongifolia | Rattlesnake plantain | Perennial herb | 4 |
| Grindelia camporum | Gumweed | Perennial herb | 14 |
| Grindelia hirsutula | Gumweed | Perennial herb | 11 |
| Grindelia hirsutula var. davyi | Davy's gumweed | Perennial herb | 13 |
| Grindelia nana | Idaho gumweed | Perennial herb | |
| Hackelia bella | Greater showy stickseed | Perennial herb | |
| Hackelia californica | California stickseed | Perennial herb | |
| Hackelia cusickii | Cusick stickweed | Perennial herb | |
| Hackelia micrantha | Jessica's stickseed | Perennial herb | |
| Hastingsia alba | White hastingsia | Perennial herb | 2 |
| Hastingsia serpentinicola | Siskiyou hastingsia | Perennial herb | |
| Helianthella californica | California helianthella | Perennial herb | 5 |
| Helianthella californica var. nevadensis | California helianthella | Perennial herb | 1 |
| Helianthus cusickii | Cusick's sunflower | Perennial herb | |
| Helianthus nuttallii | Nuttall's sunflower | Perennial herb | |
| Heliotropium curassavicum | Chinese parsley | Perennial herb | 8 |
| Heliotropium curassavicum var. oculatum | Seaside heliotrope | Perennial herb | 2 |
| Heracleum lanatum | Cow parsnip | Perennial herb | 20 |
| Heracleum maximum | Common cow parsnip | Perennial herb | 20 |
| Hesperochiron californicus | California hesperochiron | Perennial herb | |
| Hesperochiron pumilus | Dwarf hesperochiron | Perennial herb | |
| Hesperostipa comata | Needle & thread grass | Perennial grass | 10 |
| Hesperostipa comata ssp. comata | Needle & thread grass | Perennial grass | 1 |
| Heteranthera dubia | Water star grass | Perennial herb | |
| Heterotheca villosa | Hairy goldenaster | Perennial herb | 10 |
| Heterotheca villosa var. hispida | Hairy goldenaster | Perennial herb | |
| Heterotheca villosa var. minor | Hairy false goldenaster | Perennial herb | |
| Heterotheca villosa var. villosa | Hairy goldenaster | Perennial herb | |
| Heuchera cylindrica | Roundleaf alumroot | Perennial herb | 8 |
| Heuchera cylindrica var. alpina | Alpine alumroot | Perennial herb | 8 |
| Heuchera rubescens | Pink alumroot | Perennial herb | 6 |
| Heuchera rubescens var. glandulosa | Pink alumroot | Perennial herb | 6 |
| Hieracium albiflorum | White flowered hawkweed | Perennial herb | 1 |
| Hieracium horridum | Shaggy hawkweed | Perennial herb | |
| Hieracium nudicaule | Naked stemmed scouler's hawkweed | Perennial herb | |
| Hieracium parryi | Scouler's woollyweed | Perennial herb | |
| Hieracium scouleri | Hounds tongue hawkweed | Perennial herb | |
| Hieracium scouleri var. nudicaule | Naked stemmed scouler's hawkweed | Perennial herb | |
| Hippuris vulgaris | Mare's tail | Perennial herb (aquatic) | 1 |
| Hordeum brachyantherum | Meadow barley | Perennial grass | 24 |
| Hordeum brachyantherum ssp. brachyantherum | Meadow barley | Perennial grass | 4 |
| Hordeum brachyantherum ssp. californicum | Meadow barley | Perennial grass | 7 |
| Hordeum jubatum | Fox tail barley | Perennial grass | 7 |
| Hordeum jubatum ssp. jubatum | Foxtail barley, squirreltail barley | Perennial grass | |
| Horkelia fusca | Tawny horkelia | Perennial herb | |
| Horkelia fusca ssp. capitata | Dark horkelia | Perennial herb | |
| Horkelia fusca ssp. parviflora | Dusky horkelia | Perennial herb | |
| Horkelia fusca var. brownii | Tawny horkelia | Perennial herb | |
| Horkelia fusca var. parviflora | Tawny horkelia | Perennial herb | |
| Horkelia fusca var. pseudocapitata | Tawny horkelia | Perennial herb | |
| Horkelia tridentata | Three toothed horkelia | Perennial herb | |
| Hosackia crassifolia | Broad leaved lotus | Perennial herb | 6 |
| Hosackia crassifolia var. crassifolia | Broad leaved lotus | Perennial herb | 2 |
| Hosackia oblongifolia | Narrow leaved lotus | Perennial herb | 2 |
| Hosackia oblongifolia var. oblongifolia | Narrow leaved lotus | Perennial herb | 1 |
| Hosackia pinnata | Pinnate lotus | Perennial herb | |
| Hulsea nana | Dwarf hulsea | Perennial herb | |
| Hydrophyllum alpestre | Alpine breeches | Perennial herb | |
| Hydrophyllum capitatum | Ballhead waterleaf | Perennial herb | |
| Hydrophyllum capitatum var. alpinum | Woolen breeches | Perennial herb | |
| Hymenoxys hoopesii | Owl's claws | Perennial herb | 10 |
| Hymenoxys lemmonii | Lemmon's goldflower | Perennial herb | |
| Hypericum formosum | St john's wort | Perennial herb | |
| Hypericum formosum var. scouleri | Scouler's st. john's wort | Perennial herb | 2 |
| Hypericum scouleri | Scouler's st john's wort | Perennial herb | 2 |
| Iliamna bakeri | Baker's globe mallow | Perennial herb | 1 |
| Ionactis alpina | Lava aster | Perennial herb | |
| Ipomopsis aggregata | Scarlet gilia | Perennial herb | 7 |
| Ipomopsis aggregata ssp. aggregata | Scarlet gilia | Perennial herb | 2 |
| Ipomopsis aggregata ssp. formosissima | Western scarlet gilia | Perennial herb | |
| Ipomopsis congesta | Ball headed gilia | Perennial herb | |
| Ipomopsis congesta ssp. montana | Mountain ball headed gilia | Perennial herb | |
| Ipomopsis congesta ssp. palmifrons | Ball headed gilia | Perennial herb | |
| Iris douglasiana | Douglas iris | Perennial herb | 52 |
| Iris hartwegii | Hartweg's iris | Perennial herb | 4 |
| Iris hartwegii ssp. hartwegii | Hartweg's iris | Perennial herb | 1 |
| Iris missouriensis | Western blue flag | Perennial herb | 25 |
| Isopyrum stipitatum | Siskiyou rue anemone | Perennial herb | |
| Iva axillaris | Povertyweed | Perennial herb | |
| Iva axillaris ssp. robustior | Poverty weed | Perennial herb | |
| Ivesia baileyi | Bailey's ivesia | Perennial herb | |
| Ivesia baileyi var. beneolens | Owyhee ivesia | Perennial herb | |
| Ivesia gordonii | Alpine ivesia | Perennial herb | |
| Ivesia gordonii var. ursinorum | Alpine ivesia | Perennial herb | |
| Ivesia paniculata | Ash creek ivesia | Perennial herb | |
| Ivesia shockleyi | Sky mousetail | Perennial herb | |
| Juncus articulatus | Jointed rush | Perennial grass | 2 |
| Juncus articulatus ssp. articulatus | Jointed rush | Perennial grass | |
| Juncus balticus | Wire rush | Perennial grass | 19 |
| Juncus balticus ssp. ater | Baltic rush | Perennial grass | 2 |
| Juncus brachyphyllus | Short leaved rush | Perennial grass | |
| Juncus bufonius var. occidentalis | Round fruited toad rush | Perennial grass | |
| Juncus confusus | Colorado rush | Perennial grass | |
| Juncus drummondii | Drummond's rush | Perennial grass | |
| Juncus ensifolius | Sword leaved rush | Perennial grass | 7 |
| Juncus longistylis | Long styled rush | Perennial grass | 1 |
| Juncus mertensianus | Merten's rush | Perennial grass | 1 |
| Juncus mexicanus | Mexican rush | Perennial grass | 10 |
| Juncus nevadensis | Sierra rush | Perennial grass | 1 |
| Juncus nevadensis var. nevadensis | Nevada or sierran rush | Perennial grass | |
| Juncus orthophyllus | Straight leaved rush | Perennial grass | 1 |
| Juncus parryi | Parry's rush | Perennial grass | |
| Juncus saximontanus | Rocky mountain rush | Perennial grass | |
| Juncus tenuis | Slender rush | Perennial grass | 9 |
| Juncus torreyi | Torrey's rush | Perennial grass | 5 |
| Juncus trilocularis | Perennial grass | ||
| Juncus xiphioides | Iris leaved rush | Perennial grass | 16 |
| Kelloggia galioides | Kelloggia | Perennial herb | |
| Kochia americana | Red sage | Perennial herb | |
| Koeleria macrantha | June grass | Perennial grass | 29 |
| Lactuca tatarica | Blue lettuce | Perennial herb | |
| Lactuca tatarica ssp. pulchella | Blue lettuce | Perennial herb | |
| Lactuca tatarica var. pulchella | Blue lettuce | Perennial herb | |
| Lathyrus brownii | Brown's brush pea | Perennial herb | |
| Lathyrus lanszwertii | Nevada pea | Perennial herb | |
| Lathyrus lanszwertii var. aridus | Dryland nevada pea | Perennial herb | |
| Lathyrus lanszwertii var. lanszwertii | Nevada pea | Perennial herb | |
| Lathyrus nevadensis | Sierra pea | Perennial herb | |
| Lathyrus nevadensis ssp. lanceolatus | Sierra pea | Perennial herb | |
| Lathyrus nevadensis ssp. nevadensis | Sierra pea | Perennial herb | |
| Lathyrus nevadensis var. nevadensis | Sierra nevada pea | Perennial herb | |
| Lathyrus rigidus | Rigid pea | Perennial herb | |
| Lemna gibba | Gibbous duckweed | Perennial herb | |
| Lemna minor | Smaller duckweed | Perennial herb | 3 |
| Lemna minuscula | Least duckweed | Perennial herb | |
| Lemna minuta | Least duckweed | Perennial herb | |
| Lemna trisulca | Star duckweed | Perennial herb | |
| Lemna turionifera | Turion duckweed | Perennial herb | |
| Lemna valdiviana | Duckweed | Perennial herb | |
| Lepidium montanum | Mountain pepper grass | Perennial herb | 1 |
| Lepidium montanum var. canescens | Mountain pepper grass | Perennial herb | 1 |
| Leptosiphon nuttallii | Nuttall's linanthus | Perennial herb | 2 |
| Leptosiphon nuttallii ssp. nuttallii | Nuttall's linanthus | Perennial herb | 2 |
| Lesquerella occidentalis ssp. occidentalis | Western bladder pod | Perennial herb | |
| Leucocrinum montanum | Sand lily | Perennial herb | |
| Lewisia nevadensis | Sierra lewisia | Perennial herb | 2 |
| Lewisia pygmaea | Pigmy bitter root | Perennial herb | 3 |
| Lewisia rediviva | Bitter root | Perennial herb | 4 |
| Lewisia rediviva var. rediviva | Bitter root | Perennial herb | |
| Lewisia triphylla | Three leaved lewisia | Perennial herb | |
| Leymus cinereus | Giant wild rye | Perennial grass | 8 |
| Leymus condensatus | Giant rye grass | Perennial grass | 34 |
| Leymus triticoides | Alkali rye | Perennial grass | 30 |
| Ligusticum californicum | California lovage | Perennial herb | |
| Ligusticum grayi | Gray's lovage | Perennial herb | |
| Lilium pardalinum | California tiger lily | Perennial herb | 23 |
| Lilium pardalinum ssp. pardalinum | Leopard lily | Perennial herb | 3 |
| Lilium pardalinum ssp. shastense | Shasta lily | Perennial herb | 1 |
| Lilium pardalinum ssp. wigginsii | Wiggins' lily | Perennial herb (bulb) | 2 |
| Lilium washingtonianum | Washington lily | Perennial herb | 6 |
| Linanthus nuttallii | Nuttall's linanthus | Perennial herb | 2 |
| Linanthus nuttallii ssp. nuttallii | Nuttall's linanthus | Perennial herb | |
| Linnaea borealis | Twinflower | Perennial herb | 8 |
| Linnaea borealis ssp. americana | Twinflower | Perennial herb | 2 |
| Linnaea borealis var. longiflora | Twin flower | Perennial herb | 2 |
| Linum lewisii | Lewis' flax | Perennial herb | 38 |
| Linum lewisii var. alpicola | Alpine lewis' flax | Perennial herb | 1 |
| Linum lewisii var. lewisii | Lewis' flax | Perennial herb | 5 |
| Listera convallarioides | Broad lipped twayblade | Perennial herb | |
| Lithophragma glabrum | Bulbed woodland star | Perennial herb | |
| Lithophragma parviflorum | Pink woodland star | Perennial herb | 1 |
| Lithophragma parviflorum var. parviflorum | Pink woodland star | Perennial herb | |
| Lithophragma tenellum | Woodland star | Perennial herb | |
| Lithospermum californicum | California gromwell | Perennial herb | |
| Lithospermum ruderale | Western gromwell | Perennial herb | |
| Lomatium austiniae | Plummer's lomatium | Perennial herb | |
| Lomatium bicolor | Wasatch desertparsley | Perennial herb | |
| Lomatium bicolor var. leptocarpum | Slender fruited lomatium | Perennial herb | |
| Lomatium canbyi | Canby's lomatium | Perennial herb | |
| Lomatium caruifolium | Caraway leaved lomatium | Perennial herb | |
| Lomatium dissectum | Fern leaved lomatium | Perennial herb | 3 |
| Lomatium dissectum var. multifidum | Fern leaved lomatium | Perennial herb | 1 |
| Lomatium donnellii | Donnell's biscuitroot | Perennial herb | |
| Lomatium foeniculaceum | Fennel leaved lomatium | Perennial herb | |
| Lomatium foeniculaceum ssp. fimbriatum | Fennel leaved lomatium | Perennial herb | |
| Lomatium foeniculaceum ssp. macdougalii | Macdougal's lomatium | Perennial herb | |
| Lomatium grayi | Gray's lomatium | Perennial herb | 2 |
| Lomatium hendersonii | Henderson's lomatium | Perennial herb | |
| Lomatium macrocarpum | Large fruited lomatium | Perennial herb | 2 |
| Lomatium multifidum | Fern leaved lomatium | Perennial herb | 1 |
| Lomatium nevadense | Nevada lomatium | Perennial herb | |
| Lomatium nevadense var. nevadense | Nevada lomatium | Perennial herb | |
| Lomatium nevadense var. parishii | Parish's lomatium | Perennial herb | |
| Lomatium nudicaule | Pestle lomatium | Perennial herb | 3 |
| Lomatium piperi | Piper's lomatium | Perennial herb | |
| Lomatium plummerae | Plummer's lomatium | Perennial herb | |
| Lomatium ravenii | Raven's lomatium | Perennial herb | |
| Lomatium ravenii var. paiutense | Paiute lomatium | Perennial herb | |
| Lomatium roseanum | Biscuitroot | Perennial herb | |
| Lomatium triternatum | Lewis's lomatium | Perennial herb | 1 |
| Lomatium triternatum var. macrocarpum | Large fruited lewis' lomatium | Perennial herb | |
| Lomatium triternatum var. triternatum | Lewis' lomatium | Perennial herb | |
| Lomatium utriculatum | Hog fennel | Perennial herb | 2 |
| Lomatium vaginatum | Sheathed lomatium | Perennial herb | |
| Lotus crassifolius | Broad leaved lotus | Perennial herb | 7 |
| Lotus crassifolius var. crassifolius | Broad leaved lotus | Perennial herb | 2 |
| Lotus nevadensis | Sierra lotus | Perennial herb | |
| Lotus nevadensis var. nevadensis | Sierra nevada lotus | Perennial herb | |
| Lotus oblongifolius | Narrow leaved lotus | Perennial herb | |
| Lotus oblongifolius var. oblongifolius | Narrow leaved lotus | Perennial herb | 1 |
| Lotus pinnatus | Pinnate lotus | Perennial herb | |
| Ludwigia palustris | Marsh purslane | Perennial herb (aquatic) | |
| Ludwigia peploides ssp. peploides | Floating water primrose | Perennial herb | |
| Lupinus albicaulis | White stemmed lupine | Perennial herb | 8 |
| Lupinus albicaulis var. shastensis | Shasta lupine | Perennial herb | |
| Lupinus arbustus | Long spurred lupine | Perennial herb | |
| Lupinus argenteus | Silvery lupine | Perennial herb | 7 |
| Lupinus argenteus var. argenteus | Silvery lupine | Perennial herb | |
| Lupinus argenteus var. heteranthus | Silvery lupine | Perennial herb | 3 |
| Lupinus argenteus var. meionanthus | Lake tahoe lupine | Perennial herb | |
| Lupinus argenteus var. palmeri | Palmer's silver lupine | Perennial herb | |
| Lupinus latifolius | Broad leaf lupine | Perennial herb | 9 |
| Lupinus latifolius var. barbatus | Hair tuft lupine | Perennial herb | |
| Lupinus latifolius var. columbianus | Broad leaved lupine | Perennial herb | |
| Lupinus latifolius var. latifolius | Broad leaf lupine | Perennial herb | |
| Lupinus latifolius var. viridifolius | Green leaf lupine | Perennial herb | |
| Lupinus lepidus | Tidy lupine | Perennial herb | 1 |
| Lupinus lepidus var. confertus | Clustered tidy lupine | Perennial herb | |
| Lupinus lepidus var. lobbii | Lobb's lupine | Perennial herb | |
| Lupinus lepidus var. ramosus | Branched tidy lupine | Perennial herb | |
| Lupinus lepidus var. sellulus | Stool lupine | Perennial herb | |
| Lupinus lepidus var. utahensis | Utah tidy lupine | Perennial herb | |
| Lupinus leucophyllus | Velvet lupine | Perennial herb | |
| Lupinus polyphyllus | Bog lupine | Perennial herb | 27 |
| Lupinus polyphyllus var. burkei | Large leaved lupine | Perennial herb | 6 |
| Lupinus rivularis | Riverbank lupine | Perennial herb | 8 |
| Lupinus saxosus | Rock lupine | Perennial herb | |
| Luzula comosa | Hairy wood rush | Perennial grass | 4 |
| Luzula comosa var. laxa | Hairy wood rush | Perennial grass | 3 |
| Luzula parviflora | Small flowered wood rush | Perennial grass | 2 |
| Luzula spicata | Spiked wood rush | Perennial grass | |
| Luzula subcongesta | Donner wood rush | Perennial grass | |
| Lycopus asper | Rough bugleweed | Perennial herb | |
| Lycopus uniflorus | Northern bugleweed | Perennial herb | |
| Lysimachia maritima | Sea milkwort | Perennial herb | |
| Lysimachia thyrsiflora | Tufted yellow loosestrife | Perennial herb | |
| Machaeranthera canescens | Hoary aster | Perennial herb | 1 |
| Machaeranthera canescens var. canescens | Hoary aster | Perennial herb | |
| Machaeranthera canescens var. shastensis | Shasta aster | Perennial herb | |
| Maianthemum racemosum | Feathery false lily of the valley | Perennial herb | 19 |
| Maianthemum racemosum ssp. amplexicaule | Feathery false lily of the valley | Perennial herb | 3 |
| Maianthemum stellatum | Starry false lily of the valley | Perennial herb | 17 |
| Marah fabacea | California man-root | Perennial herb, Vine | 5 |
| Marah fabaceus | Manroot | Perennial herb, Vine | 6 |
| Marah fabaceus var. agrestis | Wild cucumber | Perennial herb, Vine | 4 |
| Marah fabaceus var. fabaceus | California manroot | Perennial herb, Vine | 4 |
| Melica bulbosa | Oniongrass | Perennial grass | 1 |
| Melica californica | California melic | Perennial grass | 25 |
| Melica fugax | Small onion grass | Perennial grass | |
| Melica spectabilis | Purple onion grass | Perennial grass (rhizomatous) | |
| Melica stricta | Nodding melica | Perennial grass | |
| Melica subulata | Alaska melic | Perennial grass | 1 |
| Mentha arvensis | American wild mint | Perennial herb | 6 |
| Mentha canadensis | Wild mint | Perennial herb | 6 |
| Mentzelia laevicaulis | Giant blazingstar | Perennial herb | 5 |
| Menyanthes trifoliata | Bogbean | Perennial herb | 2 |
| Mertensia ciliata | Ciliate lungwort | Perennial herb | |
| Mertensia ciliata var. stomatechoides | Streamside bluebells | Perennial herb | |
| Mertensia cusickii | Toiyabe bluebells | Perennial herb | |
| Mertensia longiflora | Long flower bluebells | Perennial herb | |
| Mertensia oblongifolia | Sagebrush bluebells | Perennial herb | |
| Mertensia oblongifolia var. amoena | Sagebrush bluebells | Perennial herb | |
| Mertensia oblongifolia var. nevadensis | Sagebrush bluebells | Perennial herb | |
| Mertensia oblongifolia var. oblongifolia | Sagebrush bluebells | Perennial herb | |
| Micranthes aprica | Sierra saxifrage | Perennial herb | |
| Micranthes howellii | Howell's saxifrage | Perennial herb | |
| Micranthes integrifolia | Smooth leaf saxifrage | Perennial herb | |
| Micranthes nidifica | Peak saxifrage | Perennial herb | |
| Micranthes oregana | Bog saxifrage | Perennial herb | |
| Microseris laciniata | Cut leaved scorzonella | Perennial herb | |
| Microseris laciniata ssp. laciniata | Cut leaved scorzonella | Perennial herb | |
| Microseris nutans | Nodding microceris | Perennial herb | |
| Mimulus lewisii | Lewis' monkey flower | Perennial herb | 12 |
| Mimulus moschatus | Musk monkeyflower | Perennial herb | 1 |
| Mimulus primuloides | Primrose monkeyflower | Perennial herb | 3 |
| Mimulus primuloides ssp. linearifolius | Primrose monkeyflower | Perennial herb | 3 |
| Mimulus primuloides ssp. primuloides | Primrose monkeyflower | Perennial herb | |
| Mimulus primuloides var. linearifolius | Primrose monkeyflower | Perennial herb | 3 |
| Mimulus primuloides var. pilosellus | Primrose monkeyflower | Perennial herb | |
| Mimulus primuloides var. primuloides | Primrose monkeyflower | Perennial herb | |
| Mimulus tilingii | Larger mountain monkeyflower | Perennial herb | 3 |
| Minuartia nuttallii | Nuttall sandwort | Perennial herb | |
| Minuartia nuttallii ssp. fragilis | Brittle sandwort | Perennial herb | |
| Minuartia nuttallii ssp. gracilis | Nuttall's sandwort | Perennial herb | |
| Minuartia nuttallii ssp. gregaria | Gregarious sandwort | Perennial herb | |
| Minuartia nuttallii var. fragilis | Nuttall sandwort | Perennial herb | |
| Minuartia nuttallii var. gracilis | Nuttall sandwort | Perennial herb | |
| Minuartia nuttallii var. gregaria | Nuttall sandwort | Perennial herb | |
| Minuartia rubella | Red seeded sandwort | Perennial herb | 1 |
| Mitella pentandra | Alpine bishop's cap | Perennial herb | 1 |
| Monardella glauca | Grey monardella | Perennial herb | 1 |
| Monardella odoratissima | Mountain monardella | Perennial herb | 21 |
| Monardella odoratissima ssp. glauca | Mountain mint | Perennial herb | 1 |
| Monardella odoratissima ssp. odoratissima | Mountain monardella | Perennial herb | |
| Monardella odoratissima ssp. pallida | Pale mountain monardella | Perennial herb | |
| Monardella odoratissima ssp. parvifolia | Matted mountain monardella | Perennial herb | |
| Monardella sheltonii | Shelton's coyote mint | Perennial herb | 1 |
| Montia chamissoi | Spring beauty | Perennial herb | |
| Muhlenbergia asperifolia | Scratchgrass | Perennial grass | 1 |
| Muhlenbergia jonesii | Jones' muhly | Perennial grass | |
| Muhlenbergia richardsonis | Richardson's muhly | Perennial grass | |
| Muilla transmontana | Great basin muilla | Perennial herb | |
| Myosotis laxa | Forget me not | Perennial herb | |
| Myriophyllum hippuroides | Western milfoil | Perennial herb (aquatic) | |
| Myriophyllum sibiricum | Siberian water milfoil | Perennial herb (aquatic) | |
| Myriophyllum verticillatum | Verticillate milfoil | Perennial herb (aquatic) | |
| Nasturtium officinale | Watercress | Perennial herb (aquatic) | 3 |
| Nestotus stenophyllus | Narrowleaf mock goldenweed | Perennial herb | |
| Nitrophila occidentalis | Western nitrophila | Perennial herb | |
| Noccaea fendleri | Pennycress | Perennial herb | |
| Noccaea fendleri ssp. glauca | Pennycress | Perennial herb | 1 |
| Nothocalais alpestris | Alpine prairie dandelion | Perennial herb | |
| Nothocalais troximoides | False agoseris | Perennial herb | |
| Nuphar luteum ssp. polysepalum | Indian pond lily | Perennial herb (aquatic) | |
| Nuphar polysepala | Rocky mountain pond-lily | Perennial herb (aquatic) | 3 |
| Oenothera caespitosa | Fragrant evening primrose | Perennial herb | 8 |
| Oenothera caespitosa ssp. crinita | Caespitose evening primrose | Perennial herb (rhizomatous) | |
| Oenothera elata | Evening primrose | Perennial herb | 16 |
| Oenothera elata ssp. hirsutissima | Evening primrose | Perennial herb | 3 |
| Oenothera flava | Yellow evening primrose | Perennial herb | |
| Oenothera flava ssp. flava | Dandelion evening primrose | Perennial herb | |
| Oenothera villosa | Hairy evening primrose | Perennial herb | |
| Oenothera villosa ssp. strigosa | Hairy evening primrose | Perennial herb | 20 |
| Olsynium douglasii | Douglas' grasswidow | Perennial herb | 4 |
| Olsynium douglasii var. douglasii | Douglas' grasswidow | Perennial herb | 4 |
| Oreocarya schoolcraftii | Schoolcraft's cryptantha | Perennial herb | |
| Oreostemma alpigenum | Tundra aster | Perennial herb | 3 |
| Oreostemma alpigenum var. andersonii | Tundra aster | Perennial herb | 1 |
| Orobanche fasciculata | Clustered broomrape | Perennial herb (parasitic) | |
| Orobanche uniflora | Naked broom rape | Perennial herb (parasitic) | |
| Orobanche uniflora var. purpurea | Naked broom rape | Perennial herb (parasitic) | |
| Orthilia secunda | One sided wintergreen | Perennial herb | |
| Osmorhiza berteroi | Sweet cicely | Perennial herb | 3 |
| Osmorhiza chilensis | Western sweet cicely | Perennial herb | 3 |
| Osmorhiza depauperata | Little sweet cicely | Perennial herb | |
| Osmorhiza occidentalis | Western sweet cicely | Perennial herb | 2 |
| Osmorhiza purpurea | Purple sweet cicely | Perennial herb | |
| Oxyria digyna | Alpine mountain sorrel | Perennial herb | |
| Packera cana | Woolly groundsel | Perennial herb | |
| Packera eurycephala | Widehead groundsel | Perennial herb | |
| Packera eurycephala var. eurycephala | Widehead groundsel | Perennial herb | |
| Packera indecora | Elegant groundsel | Perennial herb | |
| Packera multilobata | Lobeleaf groundsel | Perennial herb | |
| Packera streptanthifolia | Rocky mountain groundsel | Perennial herb | |
| Packera subnuda | Buek's groundsel | Perennial herb | |
| Packera subnuda var. subnuda | Cleftleaf groundsel | Perennial herb | |
| Paeonia brownii | Peony | Perennial herb | 1 |
| Parnassia fimbriata | Rocky mountain parnassia | Perennial herb | |
| Pascopyrum smithii | Western wheat grass | Perennial grass | 4 |
| Pectiantia pentandra | Alpine mitrewort | Perennial herb | 1 |
| Pedicularis attollens | Attol lousewort | Perennial herb | |
| Pedicularis densiflora | Indian warrior | Perennial herb | 1 |
| Pedicularis groenlandica | Elephant head lousewort | Perennial herb | 2 |
| Pedicularis semibarbata | Pine woods lousewort | Perennial herb | |
| Penstemon anguineus | Siskiyou beardtongue | Perennial herb | 1 |
| Penstemon cinereus | Gray beardtongue | Perennial herb | |
| Penstemon cinicola | Ash beardtongue | Perennial herb | |
| Penstemon davidsonii | Davidson's penstemon | Perennial herb | 8 |
| Penstemon davidsonii var. davidsonii | Davidson's beardtongue | Perennial herb | 2 |
| Penstemon deustus | Rock penstemon | Perennial herb | 2 |
| Penstemon deustus var. pedicellatus | Hot rock beardtongue | Perennial herb | |
| Penstemon gracilentus | Slender beardtongue | Perennial herb | 1 |
| Penstemon heterodoxus | Sierra penstemon | Perennial herb | |
| Penstemon heterodoxus var. shastensis | Shasta beardtongue | Perennial herb | |
| Penstemon humilis | Low beardtongue | Perennial herb | |
| Penstemon humilis ssp. humilis | Low beardtongue | Perennial herb | |
| Penstemon humilis var. humilis | Low beardtongue | Perennial herb | |
| Penstemon janishiae | Antelope valley beardtongue | Perennial herb | 1 |
| Penstemon laetus | Mountain blue penstemon | Perennial herb | 1 |
| Penstemon laetus var. sagittatus | Mountain blue penstemon | Perennial herb | |
| Penstemon procerus | Small flowered penstemon | Perennial herb | 7 |
| Penstemon roezlii | Regel's mountain penstemon | Perennial herb | 1 |
| Penstemon rydbergii | Rydberg's penstemon | Perennial herb | 24 |
| Penstemon rydbergii var. oreocharis | Meadow beardtongue | Perennial herb | 1 |
| Penstemon speciosus | Showy penstemon | Perennial herb | 13 |
| Perideridia bolanderi | Bolander's yampah | Perennial herb | 2 |
| Perideridia bolanderi ssp. bolanderi | Bolander's yampah | Perennial herb | |
| Perideridia gairdneri | Gairdner's yampah | Perennial herb | 2 |
| Perideridia gairdneri ssp. gairdneri | Gairdner's yampah | Perennial herb | |
| Perideridia kelloggii | Yampah | Perennial herb | 5 |
| Perideridia oregana | Oregon yampah | Perennial herb | 1 |
| Persicaria amphibia | Water smartweed | Perennial herb (aquatic) | 2 |
| Persicaria punctata | Dotted smartweed | Perennial herb | 4 |
| Phacelia egena | Rock phacelia | Perennial herb | 3 |
| Phacelia hastata | White leafed phacelia | Perennial herb | |
| Phacelia hastata ssp. compacta | Timberline phacelia | Perennial herb | |
| Phacelia hastata ssp. hastata | Mountain phacelia | Perennial herb | |
| Phacelia hastata var. compacta | Timberline phacelia | Perennial herb | |
| Phacelia hastata var. hastata | Mountain phacelia | Perennial herb | |
| Phacelia heterophylla | Varileaf phacelia | Perennial herb | 1 |
| Phacelia heterophylla ssp. virgata | Varied leaf phacelia | Perennial herb | |
| Phacelia heterophylla var. virgata | Varied leaf phacelia | Perennial herb | |
| Phacelia imbricata | Imbricate phacelia | Perennial herb | 3 |
| Phacelia mutabilis | Changeable phacelia | Perennial herb | |
| Phacelia procera | Tall phacelia | Perennial herb | |
| Phacelia ramosissima | Branching phacelia | Perennial herb | 3 |
| Phacelia ramosissima var. eremophila | Branching phacelia | Perennial herb | 3 |
| Phacelia ramosissima var. ramosissima | Branching phacelia | Perennial herb | |
| Phacelia sericea | Silky phacelia | Perennial herb | 2 |
| Phacelia sericea ssp. ciliosa | Silky phacelia | Perennial herb | |
| Phacelia sericea var. ciliosa | Blue alpine phacelia | Perennial herb | |
| Phalaris arundinacea | Reed canarygrass | Perennial grass | 8 |
| Phleum alpinum | Timothy grass | Perennial grass | 2 |
| Phlox adsurgens | Northern phlox | Perennial herb | 3 |
| Phlox austromontana | Southern mountain phlox | Perennial herb | |
| Phlox caespitosa | Tufted phlox | Perennial herb | |
| Phlox condensata | Condensed phlox | Perennial herb | |
| Phlox diffusa | Spreading phlox | Perennial herb | 3 |
| Phlox douglasii | Douglas' phlox | Perennial herb | 1 |
| Phlox douglasii ssp. rigida | Stiff douglas' phlox | Perennial herb | 1 |
| Phlox hoodii | Spiny phlox | Perennial herb | |
| Phlox hoodii ssp. canescens | Hood's phlox | Perennial herb | |
| Phlox hoodii ssp. lanata | Carpet phlox | Perennial herb | |
| Phlox hoodii ssp. muscoides | Musk phlox | Perennial herb | |
| Phlox longifolia ssp. brevifolia | Longleaf phlox | Perennial herb | |
| Phlox muscoides | Moss phlox | Perennial herb | 2 |
| Phlox speciosa | Showy phlox | Perennial herb | |
| Phlox speciosa ssp. occidentalis | Western showy phlox | Perennial herb | |
| Phlox stansburyi | Cold desert phlox | Perennial herb | |
| Phlox stansburyi var. brevifolia | Cold-desert phlox | Perennial herb | |
| Phlox viridis ssp. compacta | Green phlox | Perennial herb | |
| Phoenicaulis cheiranthoides | Dagger pod | Perennial herb | 1 |
| Phoradendron densum | Dense mistletoe | Perennial herb | |
| Phragmites australis | Common reed | Perennial grass | 1 |
| Physaria occidentalis | Western bladderpod | Perennial herb | |
| Piperia unalascensis | Alaska piperia | Perennial herb | |
| Plagiobothrys mollis | Downy popcorn flower | Perennial herb | |
| Plagiobothrys mollis var. mollis | Downy popcorn flower | Perennial herb | |
| Plagiobothrys nitens | Shiny nutlet popcorn flower | Perennial herb | |
| Platanthera dilatata | Scentbottle | Perennial herb | |
| Platanthera dilatata var. leucostachys | Sierra bog orchid | Perennial herb | |
| Platanthera leucostachys | White flowered bog orchid | Perennial herb | |
| Platanthera stricta | Slender bog orchid | Perennial herb | |
| Pleiacanthus spinosus | Thorn skeletonweed | Perennial herb | |
| Poa ampla | Western blue grass | Perennial grass | 15 |
| Poa cusickii | Cusick's bluegrass | Perennial grass | |
| Poa cusickii ssp. cusickii | Cusick's blue grass | Perennial grass | |
| Poa cusickii ssp. epilis | Skyline bluegrass | Perennial grass | |
| Poa juncifolia | Western blue grass | Perennial grass | 14 |
| Poa leptocoma | Marsh bluegrass | Perennial grass | |
| Poa leptocoma ssp. leptocoma | Bog blue grass | Perennial grass | |
| Poa nevadensis | Sierra blue grass | Perennial grass | 14 |
| Poa pratensis ssp. agassizensis | Agassiz kentucky blue grass | Perennial grass | |
| Poa secunda | Pine bluegrass | Perennial grass | 17 |
| Poa secunda ssp. juncifolia | Rush blue grass | Perennial grass | 14 |
| Poa secunda ssp. secunda | Sandberg's bluegrass | Perennial grass | 18 |
| Poa wheeleri | Hooker's bluegrass | Perennial grass | 1 |
| Polemonium occidentale | Great polemonium | Perennial herb | 3 |
| Polemonium occidentale ssp. occidentale | Western polemonium | Perennial herb | 2 |
| Polemonium pulcherrimum | Sky pilot | Perennial herb | 3 |
| Polemonium pulcherrimum var. pilosum | White flowered sky pilot | Perennial herb | |
| Polemonium pulcherrimum var. pulcherrimum | Sky pilot | Perennial herb | |
| Polyctenium fremontii | Fremont's polyctenium | Perennial herb | |
| Polyctenium fremontii var. fremontii | Fremont's polyctenium | Perennial herb | |
| Polyctenium williamsiae | Williams's combleaf | Perennial herb | |
| Polygala subspinosa | Spiny milkwort | Perennial herb | |
| Polygonum amphibium | Water smartweed | Perennial herb | 2 |
| Polygonum amphibium var. emersum | Water smartweed | Perennial herb (aquatic) | 1 |
| Polygonum amphibium var. stipulaceum | Water smartweed | Perennial herb | 1 |
| Polygonum bistortoides | Western knotweed | Perennial herb | |
| Polygonum punctatum | Punctate smartweed | Perennial herb | 4 |
| Potamogeton alpinus | Alpine pondweed | Perennial herb (aquatic) | |
| Potamogeton diversifolius | Rafinesque's pondweed | Perennial herb (aquatic) | |
| Potamogeton epihydrus | Ribbonleaf pondweed | Perennial herb (rhizomatous) | |
| Potamogeton epihydrus ssp. nuttallii | Nuttall's pondweed | Perennial herb (rhizomatous) | |
| Potamogeton filiformis | Slender leaved pondweed | Perennial herb (rhizomatous) | |
| Potamogeton foliosus | Leafy pondweed | Perennial herb (aquatic) | |
| Potamogeton foliosus ssp. foliosus | Leafy pondweed | Perennial herb (aquatic) | |
| Potamogeton foliosus var. foliosus | Pondweed | Perennial herb (aquatic) | |
| Potamogeton gramineus | Grass leaf pondweed | Perennial herb (aquatic) | |
| Potamogeton latifolius | Nevada pondweed | Perennial herb (aquatic) | |
| Potamogeton natans | Floating leaved pondweed | Perennial herb (aquatic) | |
| Potamogeton nodosus | Pondweed | Perennial herb (aquatic) | |
| Potamogeton pectinatus | Fennel pondweed | Perennial herb (aquatic) | |
| Potamogeton pusillus | Small pondweed | Perennial herb (aquatic) | |
| Potamogeton pusillus var. pusillus | Small pondweed | Perennial herb (aquatic) | |
| Potamogeton richardsonii | Richardson's pondweed | Perennial herb (aquatic) | |
| Potentilla anserina | Silver weed cinquefoil | Perennial herb | 16 |
| Potentilla anserina ssp. anserina | Silver weed cinquefoil | Perennial herb | 3 |
| Potentilla biennis | Biennial cinquefoil | Perennial herb | 1 |
| Potentilla breweri | Brewer's cinquefoil | Perennial herb | 1 |
| Potentilla bruceae | Bruce's cinquefoil | Perennial herb | 1 |
| Potentilla diversifolia | Varileaf cinquefoil | Perennial herb | |
| Potentilla diversifolia var. diversifolia | Varileaf cinquefoil | Perennial herb | |
| Potentilla drummondii | Drummond's cinquefoil | Perennial herb | 2 |
| Potentilla drummondii ssp. breweri | Brewer's cinquefoil | Perennial herb | 1 |
| Potentilla drummondii ssp. bruceae | Bruce's cinquefoil | Perennial herb | 1 |
| Potentilla flabellifolia | Fan leaved cinquefoil | Perennial herb | |
| Potentilla glandulosa | Gland cinquefoil | Perennial herb | 12 |
| Potentilla glandulosa ssp. ashlandica | Mountain cinquefoil | Perennial herb | |
| Potentilla glandulosa ssp. glandulosa | Sticky cinquefoil | Perennial herb | |
| Potentilla glandulosa ssp. nevadensis | Nevada cinquefoil | Perennial herb | |
| Potentilla glandulosa ssp. pseudorupestris | False rock loving cinquefoil | Perennial herb | 1 |
| Potentilla glandulosa ssp. reflexa | Sticky cinquefoil | Perennial herb | |
| Potentilla glaucophylla | Blueleaf cinquefoil | Perennial herb | |
| Potentilla glaucophylla var. glaucophylla | Blueleaf cinquefoil | Perennial herb | |
| Potentilla gracilis | Northwest cinquefoil | Perennial herb | 15 |
| Potentilla gracilis var. fastigiata | Slender cinquefoil | Perennial herb | |
| Potentilla gracilis var. flabelliformis | Cupform leaf cinquefoil | Perennial herb | |
| Potentilla millefolia | Cut leaf cinquefoil | Perennial herb | |
| Potentilla newberryi | Newberry's cinquefoil | Perennial herb | |
| Potentilla palustris | Marsh cinquefoil | Perennial herb | 5 |
| Potentilla wheeleri | Wheeler's cinquefoil | Perennial herb | |
| Primula conjugens | Bonneville shooting star | Perennial herb | |
| Primula hendersonii | Mosquito bill | Perennial herb | 11 |
| Primula pauciflora | Beautiful shootingstar | Perennial herb | 6 |
| Primula tetrandra | Alpine shooting star | Perennial herb | 2 |
| Prunella vulgaris | Self heal | Perennial herb | 19 |
| Prunella vulgaris var. lanceolata | Mountain selfheal | Perennial herb | 8 |
| Pseudognaphalium thermale | Small headed cudweed | Perennial herb | |
| Pseudoroegneria spicata | Bluebunch wheatgrass | Perennial grass | 4 |
| Pseudoroegneria spicata ssp. spicata | Bent grass | Perennial grass | 3 |
| Pseudostellaria jamesiana | Tubered starwort | Perennial herb | |
| Pterospora andromedea | Pine drops | Perennial herb (parasitic) | |
| Puccinellia californica | Sierra nevada alkali grass | Perennial grass (rhizomatous) | |
| Puccinellia lemmonii | Lemmon's alkali grass | Perennial grass | |
| Puccinellia nuttalliana | Nuttall's alkali grass | Perennial grass | 1 |
| Pyrola aphylla | Leafless wintergreen | Perennial herb | |
| Pyrola dentata | Toothed wintergreen | Perennial herb | |
| Pyrola minor | Lesser wintergreen | Perennial herb | |
| Pyrola picta | White veined shinleaf | Perennial herb | |
| Pyrrocoma carthamoides | Largeflower goldenweed | Perennial herb | |
| Pyrrocoma carthamoides var. cusickii | Cusick's columbia pyrrocoma | Perennial herb | |
| Pyrrocoma hirta | Sticky pyrrocoma | Perennial herb | |
| Pyrrocoma hirta var. hirta | Sticky pyrrocoma | Perennial herb | |
| Pyrrocoma hirta var. lanulosa | Woolly pyrrocoma | Perennial herb | |
| Pyrrocoma lanceolata | Intermountain pyrrocoma | Perennial herb | |
| Pyrrocoma lanceolata var. lanceolata | Intermountain pyrrocoma | Perennial herb | |
| Pyrrocoma lanceolata var. subviscosa | Sticky intermountain pyrrocoma | Perennial herb | |
| Pyrrocoma racemosa | Racemose pyrrocoma | Perennial herb | |
| Pyrrocoma racemosa var. paniculata | Panicled pyrrocoma | Perennial herb | |
| Pyrrocoma uniflora | Single headed pyrrocoma | Perennial herb | |
| Pyrrocoma uniflora var. uniflora | Single headed pyrrocoma | Perennial herb | |
| Raillardella argentea | Silky raillardella | Perennial herb | |
| Ranunculus alismifolius | Common water plantain buttercup | Perennial herb | |
| Ranunculus alismifolius var. alismellus | Slender buttercup | Perennial herb | |
| Ranunculus alismifolius var. alismifolius | Water plantain buttercup | Perennial herb | |
| Ranunculus alismifolius var. hartwegii | Common water plantain buttercup | Perennial herb | |
| Ranunculus andersonii | Anderson's buttercup | Perennial herb | |
| Ranunculus aquatilis | white water butter cup | Perennial herb (aquatic) | |
| Ranunculus aquatilis var. aquatilis | White water butter cup | Perennial herb (aquatic) | |
| Ranunculus aquatilis var. capillaceus | Threadleaf crowfoot | Perennial herb (aquatic) | |
| Ranunculus aquatilis var. diffusus | white water butter cup | Perennial herb (aquatic) | |
| Ranunculus aquatilis var. hispidulus | White water crowfoot | Perennial herb (aquatic) | |
| Ranunculus aquatilis var. subrigidus | Longbeak buttercup | Perennial herb (aquatic) | |
| Ranunculus californicus | Common buttercup | Perennial herb | 11 |
| Ranunculus cymbalaria | Alkali buttercup | Perennial herb | |
| Ranunculus cymbalaria var. saximontanus | Rocky mountain buttercup | Perennial herb | |
| Ranunculus eschscholtzii | Eschscholtz's buttercup | Perennial herb | |
| Ranunculus eschscholtzii var. oxynotus | Eschscholtz's buttercup | Perennial herb | |
| Ranunculus flabellaris | Water buttercup | Perennial herb | |
| Ranunculus flammula | Spearwort | Perennial herb | 1 |
| Ranunculus flammula var. ovalis | Greater creeping spearwort | Perennial herb | |
| Ranunculus glaberrimus | Smooth buttercup | Perennial herb | |
| Ranunculus glaberrimus var. ellipticus | Narrow leaved smooth buttercup | Perennial herb | |
| Ranunculus glaberrimus var. glaberrimus | Smooth buttercup | Perennial herb | |
| Ranunculus longirostris | Longbeak buttercup | Perennial herb (aquatic) | |
| Ranunculus occidentalis | Western buttercup | Perennial herb | 6 |
| Ranunculus occidentalis var. dissectus | Western buttercup | Perennial herb | |
| Ranunculus occidentalis var. howellii | Western buttercup | Perennial herb | |
| Ranunculus occidentalis var. occidentalis | Western buttercup | Perennial herb | |
| Ranunculus occidentalis var. ultramontanus | Western buttercup | Perennial herb | |
| Ranunculus orthorhynchus | Bloomer's buttercup | Perennial herb | |
| Ranunculus orthorhynchus var. orthorhynchus | Straight beaked buttercup | Perennial herb | |
| Rhodiola integrifolia | Ledge stonecrop | Perennial herb | 1 |
| Rhodiola integrifolia ssp. integrifolia | Ledge stonecrop | Perennial herb | |
| Rorippa columbiae | Columbia yellow cress | Perennial herb (rhizomatous) | |
| Rorippa nasturtium-aquaticum | Water cress | Perennial herb (aquatic) | 3 |
| Rorippa sinuata | Spreading yellow cress | Perennial herb (aquatic) | |
| Rumex californicus | California dock | Perennial herb | |
| Rumex lacustris | Lake dock | Perennial herb (aquatic) | |
| Rumex occidentalis | Western dock | Perennial herb | 1 |
| Rumex paucifolius | Few leaved dock | Perennial herb | |
| Rumex salicifolius | Willow leaved dock | Perennial herb | 6 |
| Rumex salicifolius var. denticulatus | Smooth valved willow dock | Perennial herb | |
| Rumex salicifolius var. lacustris | Lake dock | Perennial herb (aquatic) | |
| Rumex salicifolius var. transitorius | Willow dock | Perennial herb | |
| Rumex salicifolius var. triangulivalvis | Willow dock | Perennial herb | |
| Rumex transitorius | Willow dock | Perennial herb | |
| Rumex triangulivalvis | Willow dock | Perennial herb | |
| Sagina saginoides | Alpine pearlwort | Perennial herb | |
| Sagittaria cuneata | Tule potato | Perennial herb | 1 |
| Sagittaria latifolia | Broad leaf arrowhead | Perennial herb (aquatic) | 11 |
| Sanicula graveolens | Sierra sanicle | Perennial herb | |
| Saxifraga aprica | Sierra saxifrage | Perennial herb | |
| Saxifraga cespitosa | Tufted saxifrage | Perennial herb | |
| Saxifraga howellii | Howell's saxifrage | Perennial herb (rhizomatous) | |
| Saxifraga integrifolia | Smooth leaf saxifrage | Perennial herb | |
| Saxifraga nidifica | Peak saxifrage | Perennial herb | |
| Saxifraga nidifica var. nidifica | Peak saifrage | Perennial herb | |
| Saxifraga oregana | Bog saxifrage | Perennial herb | |
| Schoenoplectus acutus | Hardstem bulrush | Perennial grass | 25 |
| Schoenoplectus acutus var. occidentalis | Tule | Perennial grass | 1 |
| Schoenoplectus americanus | Chairmaker's bulrush | Perennial grass | 17 |
| Schoenoplectus pungens | Common threesquare | Perennial grass | 2 |
| Schoenoplectus pungens var. badius | Common threesquare | Perennial grass | |
| Schoenoplectus pungens var. longispicatus | Common threesquare | Perennial grass | 2 |
| Scirpus acutus var. occidentalis | Hard stemmed tule | Perennial grass | 1 |
| Scirpus americanus | American tule | Perennial grass | 17 |
| Scirpus congdonii | Congdon's bulrush | Perennial grass | |
| Scirpus fluviatilis | River bulrush | Perennial grass | 2 |
| Scirpus maritimus | Prairie bulrush | Perennial grass | 15 |
| Scirpus microcarpus | Small fruited bulrush | Perennial grass | 20 |
| Scirpus nevadensis | Great basin bulrush | Perennial grass | |
| Scirpus pungens | Three square | Perennial grass | 2 |
| Scrophularia desertorum | Desert figwort | Perennial herb | |
| Scrophularia lanceolata | Mountain figwort | Perennial herb | 1 |
| Scutellaria antirrhinoides | Snapdragon skullcap | Perennial herb | 2 |
| Scutellaria galericulata | Marsh skullcap | Perennial herb (rhizomatous) | |
| Scutellaria nana | Little skullcap | Perennial herb (rhizomatous) | |
| Sedum lanceolatum | Lance leaf stonecrop | Perennial herb | 4 |
| Sedum roseum ssp. integrifolium | Rosy stonecrop | Perennial herb | |
| Sedum stenopetalum | Narrow leaf stonecrop | Perennial herb | 9 |
| Senecio aronicoides | Butterweed | Perennial herb | |
| Senecio canus | Woolly ragwort | Perennial herb | |
| Senecio cymbalarioides | Cleft leaved groundsel | Perennial herb | |
| Senecio eurycephalus | Cut leaved butterweed | Perennial herb | |
| Senecio eurycephalus var. eurycephalus | Broadhead ragwort | Perennial herb | |
| Senecio fremontii | Fremont's groundsel | Perennial herb | |
| Senecio fremontii var. fremontii | Fremont's groundsel | Perennial herb | |
| Senecio fremontii var. occidentalis | Western fremont's groundsel | Perennial herb | |
| Senecio hydrophiloides | Sweet marsh ragwort | Perennial herb | |
| Senecio hydrophilus | Alkali marsh ragwort | Perennial herb | |
| Senecio indecorus | Rayless mountain butterweed | Perennial herb | |
| Senecio integerrimus | Mountain butterweed | Perennial herb | |
| Senecio integerrimus var. exaltatus | Columbia mountain butterweed | Perennial herb | |
| Senecio integerrimus var. major | Lambstongue groundsel | Perennial herb | |
| Senecio multilobatus | Basin butterweed | Perennial herb | |
| Senecio serra | Tall ragwort | Perennial herb | |
| Senecio serra var. serra | Tall ragwort | Perennial herb | |
| Senecio streptanthifolius | Cleft leaved groundsel | Perennial herb | |
| Senecio triangularis | Groundsel | Perennial herb | |
| Sibbaldia procumbens | Sibbaldia | Perennial herb | |
| Sidalcea glaucescens | Glaucous checker mallow | Perennial herb | |
| Sidalcea malviflora | Wild hollyhock | Perennial herb | 20 |
| Sidalcea oregana | Oregon checker mallow | Perennial herb | 4 |
| Sidalcea oregana ssp. oregana | Oregon checker mallow | Perennial herb | |
| Sidalcea oregana ssp. spicata | Oregon checker mallow | Perennial herb | 1 |
| Silene bernardina | Palmer's campion | Perennial herb | |
| Silene douglasii | Douglas' campion | Perennial herb | 1 |
| Silene douglasii var. douglasii | Douglas's catchfly | Perennial herb | |
| Silene lemmonii | Lemmon's catchfly | Perennial herb | |
| Silene menziesii | Menzies' campion | Perennial herb | |
| Silene nuda | Naked campion | Perennial herb | |
| Silene occidentalis | Western campion | Perennial herb | 1 |
| Silene occidentalis ssp. occidentalis | Western campion | Perennial herb | 1 |
| Silene oregana | Oregon campion | Perennial herb | |
| Sisyrinchium bellum | Blue eyed grass | Perennial herb | 62 |
| Sisyrinchium douglasii var. douglasii | Douglas' blue eyed grass | Perennial herb | 1 |
| Sisyrinchium halophilum | Nevada blue eyed grass | Perennial herb | |
| Sisyrinchium idahoense | Idaho blue eyed grass | Perennial herb | 5 |
| Sisyrinchium idahoense var. idahoense | Idaho blue eyed grass | Perennial herb | 1 |
| Sium suave | Hemlock water parsnip | Perennial herb | 1 |
| Smilacina racemosa | Western false solomon's seal | Perennial herb | 19 |
| Smilacina stellata | Star flowered false solomon's seal | Perennial herb | 17 |
| Solidago californica | Oreja de liebre | Perennial herb | 27 |
| Solidago canadensis | Canada goldenrod | Perennial herb | 16 |
| Solidago canadensis ssp. elongata | Canada goldenrod | Perennial herb | 4 |
| Solidago canadensis var. salebrosa | Rough canada goldenrod | Perennial herb | 1 |
| Solidago confinis | Southern goldenrod | Perennial herb | 4 |
| Solidago elongata | West coast canada goldenrod | Perennial herb | 4 |
| Solidago gigantea | Smooth goldenrod | Perennial herb (rhizomatous) | |
| Solidago lepida | Western goldenrod | Perennial herb (rhizomatous) | |
| Solidago lepida var. salebrosa | Western goldenrod | Perennial herb (rhizomatous) | 1 |
| Solidago sparsiflora | Great basin goldenrod | Perennial herb | 4 |
| Solidago spectabilis | Showy goldenrod | Perennial herb | 3 |
| Solidago velutina | Threenerve goldenrod | Perennial herb | 8 |
| Solidago velutina ssp. californica | Oreja de liebre | Perennial herb | 27 |
| Solidago velutina ssp. sparsiflora | Great basin goldenrod | Perennial herb | 2 |
| Sparganium angustifolium | Narrow leaved bur reed | Perennial herb | 2 |
| Sparganium emersum | Emersed bur-reed | Perennial herb | 2 |
| Sparganium eurycarpum | Broadfruit bur reed | Perennial herb | 5 |
| Sparganium eurycarpum ssp. eurycarpum | Bur reed | Perennial herb | 3 |
| Sparganium eurycarpum var. eurycarpum | Broadfruit bur reed | Perennial herb | |
| Sparganium natans | Small bur reed | Perennial herb (rhizomatous) | |
| Spartina gracilis | Alkali cord grass | Perennial grass (rhizomatous) | |
| Sphaeromeria potentilloides | Cinquefoil tansy | Perennial herb | |
| Sphaeromeria potentilloides var. potentilloides | Cinquefoil tansy | Perennial herb | |
| Sphenosciadium capitellatum | Grayswamp whiteheads | Perennial herb | 2 |
| Spiranthes porrifolia | Western ladies tresses | Perennial herb | |
| Spiranthes romanzoffiana | Ladies' tresses | Perennial herb | |
| Spirodela polyrhiza | Giant duckmeat | Perennial herb | |
| Spirodela polyrrhiza | Giant duckmeat | Perennial herb | |
| Stachys ajugoides | Hedge nettle | Perennial herb | 7 |
| Stachys ajugoides var. ajugoides | Ajuga hedge nettle | Perennial herb | 7 |
| Stachys ajugoides var. rigida | Hedge nettle | Perennial herb | |
| Stachys bergii | Berg's hedgenettle | Perennial herb | 1 |
| Stachys mexicana | Mexican hedgenettle | Perennial herb | 1 |
| Stachys palustris | Marsh hedgenettle | Perennial herb | 1 |
| Stachys palustris ssp. pilosa | Marsh hedge nettle | Perennial herb | 1 |
| Stachys pilosa | Prairie woundwort | Perennial herb | 1 |
| Stachys rigida | Rough hedgenettle | Perennial herb | 4 |
| Stachys rigida var. quercetorum | Rough hedgenettle | Perennial herb | 1 |
| Stachys rigida var. rigida | Rough hedgenettle | Perennial herb | 1 |
| Stellaria calycantha | Northern bogwort | Perennial herb | |
| Stellaria longifolia | Long leaved starwort | Perennial herb (rhizomatous) | |
| Stellaria longipes | Longstalk starwort | Perennial herb | |
| Stellaria longipes ssp. longipes | Chickweed, starwort | Perennial herb | |
| Stellaria longipes var. longipes | Long stalked starwort | Perennial herb | |
| Stellaria obtusa | Obtuse starwort | Perennial herb (rhizomatous) | |
| Stellaria umbellata | Umbellate chickweed | Perennial herb | |
| Stenotus acaulis | Stemless mock goldenweed | Perennial herb | |
| Stenotus lanuginosus | Woolly stenotus | Perennial herb | |
| Stenotus lanuginosus var. lanuginosus | Woolly stenotus | Perennial herb | |
| Stenotus stenophyllus | Narrowleaf goldenweed | Perennial herb | |
| Stephanomeria lactucina | Large flowered stephanomeria | Perennial herb | |
| Stephanomeria spinosa | Thorny skeleton plant | Perennial herb | |
| Stephanomeria tenuifolia | Narrow leaved wire lettuce | Perennial herb | |
| Stipa comata | Needle-and-thread | Perennial grass | 10 |
| Stipa hymenoides | Indian rice grass | Perennial grass | 15 |
| Stipa lemmonii | Lemmon's needle grass | Perennial grass | 2 |
| Stipa lemmonii var. lemmonii | Lemmon's needle grass | Perennial grass | |
| Stipa lettermanii | Letterman's needle grass | Perennial grass | 1 |
| Stipa nelsonii | Mountain needle grass | Perennial grass | |
| Stipa nelsonii var. dorei | Mountain needle grass | Perennial grass | 4 |
| Stipa nevadensis | Nevada needle grass | Perennial grass | |
| Stipa occidentalis | Western needlegrass | Perennial grass | 1 |
| Stipa occidentalis var. californica | California needle grass | Perennial grass | |
| Stipa occidentalis var. occidentalis | Western needle grass | Perennial grass | |
| Stipa occidentalis var. pubescens | Common western needle grass | Perennial grass | |
| Stipa pinetorum | Pinewoods needle grass | Perennial grass | |
| Stipa thurberiana | Thurber's needle grass | Perennial grass | |
| Stipa webberi | Webber's needle grass | Perennial grass | |
| Streptanthus cordatus | Heartleaf jewelflower | Perennial herb | |
| Streptanthus cordatus var. cordatus | Heartleaf jewelflower | Perennial herb | |
| Streptanthus cordatus var. duranii | Duran's jewelflower | Perennial herb | |
| Streptopus amplexifolius | Claspleaf twistedstalk | Perennial herb | 1 |
| Streptopus amplexifolius var. americanus | Twisted stalk | Perennial herb | |
| Stuckenia filiformis | Fineleaf pondweed | Perennial herb (rhizomatous) | |
| Stuckenia filiformis ssp. alpina | Fineleaf pondweed | Perennial herb | |
| Stuckenia pectinata | Sago pondweed | Perennial herb (aquatic) | |
| Stuckenia striata | Broadleaf pondweed | Perennial herb (aquatic) | |
| Suaeda moquinii | Bush seepweed | Perennial herb | 3 |
| Suaeda nigra | Bush seepweed | Perennial herb | 3 |
| Swertia albicaulis | Whitestem gentian | Perennial herb | |
| Swertia albicaulis var. albicaulis | White stem green gentian | Perennial herb | |
| Swertia albicaulis var. nitida | Shining swertia | Perennial herb | |
| Swertia radiata | Giant frasera | Perennial herb | |
| Swertia radiata var. radiata | Elkweed | Perennial herb | |
| Swertia shastaensis | Perennial herb | ||
| Symphyotrichum ascendens | Western aster | Perennial herb | 1 |
| Symphyotrichum bracteolatum | Eaton's aster | Perennial herb | 2 |
| Symphyotrichum campestre | Western meadow aster | Perennial herb | |
| Symphyotrichum campestre var. campestre | Western meadow aster | Perennial herb | |
| Symphyotrichum eatonii | Eaton's aster | Perennial herb | 2 |
| Symphyotrichum foliaceum | Alpine leafybract aster | Perennial herb | 2 |
| Symphyotrichum foliaceum var. apricum | Alpine leafybract aster | Perennial herb | 1 |
| Symphyotrichum foliaceum var. parryi | Parry's aster | Perennial herb | 1 |
| Symphyotrichum spathulatum | Western mountain aster | Perennial herb | 1 |
| Symphyotrichum spathulatum var. intermedium | Larger western mountain aster | Perennial herb | |
| Symphyotrichum spathulatum var. spathulatum | Western mountain aster | Perennial herb | |
| Synthyris missurica | Kittentails | Perennial herb | |
| Synthyris missurica ssp. missurica | Kitten tails | Perennial herb (rhizomatous) | |
| Synthyris reniformis | Snow queen | Perennial herb | 1 |
| Taraxia subacaulis | Long leaved suncup | Perennial herb | |
| Taraxia tanacetifolia | Tansy leaf evening primrose | Perennial herb | |
| Thalictrum fendleri | Fendler's meadow rue | Perennial herb | 11 |
| Thalictrum fendleri var. fendleri | Fendler's meadow rue | Perennial herb | |
| Thalictrum occidentale | Western meadow rue | Perennial herb | 6 |
| Thalictrum sparsiflorum | Few flowered meadow rue | Perennial herb | |
| Thelypodium brachycarpum | Short podded thelypodium | Perennial herb | |
| Thelypodium flexuosum | Nodding thelypodium | Perennial herb | |
| Thelypodium howellii | Howell's thelypody | Perennial herb | |
| Thelypodium howellii ssp. howellii | Howell's thelypodium | Perennial herb | |
| Thelypodium milleflorum | Yarrow leaf thelypodium | Perennial herb | |
| Thermopsis californica | California goldenbanner | Perennial herb | 1 |
| Thermopsis californica var. argentata | Silvery false lupine | Perennial herb (rhizomatous) | |
| Thermopsis macrophylla | Santa ynez false lupine | Perennial herb | 2 |
| Thermopsis macrophylla var. argentata | Silvery false lupine | Perennial herb (rhizomatous) | |
| Torreyochloa pallida | Pale false mannagrass | Perennial grass (rhizomatous) | |
| Torreyochloa pallida var. pauciflora | Mannagrass | Perennial grass (rhizomatous) | |
| Toxicoscordion fremontii | Fremont's star lily | Perennial herb | 5 |
| Toxicoscordion paniculatum | Foothill deathcamas | Perennial herb | 2 |
| Toxicoscordion venenosum | Meadow deathcamas | Perennial herb | |
| Toxicoscordion venenosum var. venenosum | Meadow deathcamas | Perennial herb | |
| Trifolium andersonii | Anderson's clover | Perennial herb | |
| Trifolium andersonii ssp. andersonii | Anderson's clover | Perennial herb | |
| Trifolium andersonii var. andersonii | Anderson's clover | Perennial herb | |
| Trifolium beckwithii | Beckwith's clover | Perennial herb | |
| Trifolium eriocephalum | Woollyhead clover | Perennial herb | |
| Trifolium eriocephalum ssp. cusickii | Cusick's clover | Perennial herb | |
| Trifolium eriocephalum var. harneyense | Cusick's clover | Perennial herb | |
| Trifolium gymnocarpon | Hollyleaf clover | Perennial herb | |
| Trifolium gymnocarpon ssp. plummerae | Plummer's clover | Perennial herb | |
| Trifolium gymnocarpon var. plummerae | Plummer's clover | Perennial herb | |
| Trifolium kingii | King's clover | Perennial herb | |
| Trifolium kingii var. productum | King's clover | Perennial herb | |
| Trifolium longipes | Long stalked clover | Perennial herb | |
| Trifolium longipes ssp. hansenii | Hansen's clover | Perennial herb | |
| Trifolium longipes ssp. multipedunculatum | Longstalk clover | Perennial herb | |
| Trifolium longipes ssp. oreganum | Oregon clover | Perennial herb | |
| Trifolium longipes ssp. shastense | Longstalk clover | Perennial herb | |
| Trifolium longipes var. longipes | Long stalked clover | Perennial herb | |
| Trifolium longipes var. nevadense | Mountain clover | Perennial herb | |
| Trifolium longipes var. oreganum | Oregon clover | Perennial herb | |
| Trifolium longipes var. shastense | Shasta clover | Perennial herb | |
| Trifolium macrocephalum | Big headed clover | Perennial herb | |
| Trifolium productum | Productive clover | Perennial herb | |
| Trifolium wormskioldii | Cow clover | Perennial herb | 8 |
| Triglochin concinna | Arrow grass | Perennial herb (aquatic) | |
| Triglochin concinna var. debilis | Slender arrow grass | Perennial herb (aquatic) | |
| Triglochin maritima | Seaside arrow grass | Perennial herb (aquatic) | 5 |
| Trimorpha lonchophylla | Spearleaved northern daisy | Perennial herb | |
| Trisetum canescens | Nodding trisetum | Perennial grass | |
| Trisetum cernuum var. projectum | Nodding oatgrass | Perennial grass | |
| Trisetum spicatum | Narrow oatgrass | Perennial grass | |
| Trisetum wolfii | Beardless oatgrass | Perennial grass | |
| Triteleia grandiflora | Largeflower triteleia | Perennial herb | |
| Triteleia hyacinthina | Wild hyacinth | Perennial herb | 9 |
| Triteleia ixioides | Pretty face | Perennial herb | 7 |
| Triteleia ixioides ssp. anilina | Mountain pretty face | Perennial herb | 1 |
| Turritis glabra | Tower rockcress | Perennial herb | |
| Typha latifolia | Broadleaf cattail | Perennial herb (aquatic) | 22 |
| Urtica dioica | Stinging nettle | Perennial herb | 11 |
| Urtica dioica ssp. holosericea | Stinging nettle | Perennial herb | 5 |
| Utricularia macrorhiza | Common bladderwort | Perennial herb | |
| Utricularia ochroleuca | Yellowishwhite bladderwort | Perennial herb | |
| Valeriana californica | California valerian | Perennial herb | |
| Valeriana occidentalis | Western valerian | Perennial herb | |
| Vancouveria hexandra | Northern vancouveria | Perennial herb | 21 |
| Veratrum californicum | California false hellebore | Perennial herb | 3 |
| Veratrum californicum var. californicum | California corn lily | Perennial herb | |
| Verbena hastata | Swamp verbena | Perennial herb | 8 |
| Veronica americana | American brooklime | Perennial herb | 6 |
| Veronica scutellata | Marsh speedwell | Perennial herb | |
| Veronica serpyllifolia | Thymeleaf speedwell | Perennial herb | |
| Veronica serpyllifolia ssp. humifusa | Sprawling speedwell | Perennial herb | |
| Veronica wormskjoldii | American alpine speedwell | Perennial herb | |
| Vicia americana | American vetch | Perennial herb, Vine | 4 |
| Vicia americana ssp. americana | American vetch | Perennial herb, Vine | |
| Vicia americana var. americana | Vetch | Perennial herb, Vine | |
| Viola adunca | Western dog violet | Perennial herb | 18 |
| Viola adunca ssp. adunca | Western dog violet | Perennial herb | 1 |
| Viola adunca var. adunca | Western bog violet | Perennial herb | 1 |
| Viola adunca var. kirkii | Yosemite dog violet | Perennial herb | 1 |
| Viola beckwithii | Great basin violet | Perennial herb | |
| Viola glabella | Stream violet | Perennial herb | 10 |
| Viola hallii | Hall's violet | Perennial herb | |
| Viola macloskeyi | Macloskey's violet | Perennial herb | 1 |
| Viola nephrophylla | Leconte violet | Perennial herb | |
| Viola pinetorum | Pine violet | Perennial herb | 2 |
| Viola pinetorum ssp. grisea | Grey leaved violet | Perennial herb | |
| Viola pinetorum ssp. pinetorum | Pine violet | Perennial herb | |
| Viola praemorsa | Astoria violet | Perennial herb | 1 |
| Viola praemorsa ssp. linguifolia | Astoria violet | Perennial herb | |
| Viola praemorsa ssp. praemorsa | Astoria violet | Perennial herb | |
| Viola purpurea | Goosefoot violet | Perennial herb | |
| Viola purpurea ssp. dimorpha | Goosefoot violet | Perennial herb | |
| Viola purpurea ssp. mesophyta | Goosefoot violet | Perennial herb | |
| Viola purpurea ssp. mohavensis | Mojave goosefoot violet | Perennial herb | |
| Viola purpurea ssp. purpurea | Goosefoot violet | Perennial herb | |
| Viola purpurea ssp. venosa | Desert violet | Perennial herb | |
| Viola sheltonii | Shelton's violet | Perennial herb | |
| Viola sororia | Common blue violet | Perennial herb | 2 |
| Viola sororia ssp. affinis | Northern bog violet | Perennial herb | |
| Wyethia angustifolia | Narrow leaved mule ears | Perennial herb | 10 |
| Wyethia helenioides | Whitehead wyethia | Perennial herb | 2 |
| Wyethia mollis | Woolly mule's ears | Perennial herb | 8 |
| Zannichellia palustris | Horned pondweed | Perennial herb | |
| Zigadenus fremontii | Fremont's death camas | Perennial herb | 5 |
| Zigadenus paniculatus | Sand corn | Perennial herb | 2 |
| Zigadenus venenosus | Meadow deathcamas | Perennial herb | 2 |
| Zigadenus venenosus var. venenosus | Death camas | Perennial herb | |
|
Lifeform: Fern | 40 plants | ||
|
Lifeform: Shrub | 222 plants | ||
|
Lifeform: Tree | 39 plants | ||
|
Lifeform: Vine | 1 plant | ||
| Cuscuta howelliana | Boggs lake dodder | Vine | |
|
Pink background indicates a plant is non-native.
! indicates a plant is potentially invasive. |
||
| NB: found in Modoc County is intended to indicate only plants found growing in the wild. However, the evidence is not always clear, and may occasionally include plants found in cultivation. To verify the wild presence of any particular plant in the list above, please click through to Calflora and look closely at the observations in this county. | ||