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Criteria:   found in Siskiyou County  •   is native  •  group by lifeform
3506  records include photos for these plants # number of sources
Scientific Name Common Name Lifeform #
  Lifeform: Annual680 plants
  Lifeform: Biennial2 plants
Descurainia incisa ssp. incisa Mountain tansy mustard Biennial herb  
Erigeron divergens Diffuse daisy Biennial, Perennial herb 4
  Lifeform: Perennial2288 plants
  Lifeform: Fern79 plants
Adiantum aleuticum Five finger fern Fern 9
Adiantum capillus-veneris Venus hair Fern 14
Adiantum shastense Shasta adiantum Fern  
Aspidotis densa Lace fern Fern 1
Asplenium septentrionale Northern spleenwort Fern (rhizomatous)  
Asplenium trichomanes spleenwort Fern (rhizomatous) 3
Asplenium trichomanes ssp. trichomanes spleenwort Fern (rhizomatous)  
Athyrium distentifolium Fern  
Athyrium distentifolium var. americanum American alpine lady fern Fern  
Athyrium filix-femina Common ladyfern Fern 19
Athyrium filix-femina ssp. cyclosorum Subarctic ladyfern Fern  
Athyrium filix-femina var. cyclosorum Western lady fern Fern 1
Azolla mexicana Mexican mosquito fern Fern  
Azolla microphylla Mexican mosquito fern Fern  
Botrychium crenulatum Scalloped moonwort Fern (rhizomatous)  
Botrychium minganense Mingan moonwort Fern (rhizomatous)  
Botrychium montanum Western goblin Fern (rhizomatous)  
Botrychium multifidum Common grapefern Fern  
Botrychium pinnatum Northwestern moonwort Fern (rhizomatous)  
Botrychium pumicola Crater lake grapefern Fern  
Botrychium simplex Little grape fern Fern  
Botrychium simplex var. compositum Little grapefern Fern  
Botrychium simplex var. simplex Least moonwort Fern  
Botrychium virginianum Rattlesnake fern Fern  
Botrypus virginianus Rattlesnake fern Fern  
Cheilanthes gracillima Lace lip fern Fern 1
Cheilanthes intertexta Coastal lipfern Fern  
Cryptogramma acrostichoides American parsley fern Fern  
Cryptogramma cascadensis Cascade parsely fern Fern  
Cystopteris fragilis Brittle fern Fern 1
Dryopteris arguta Wood fern Fern 7
Dryopteris expansa Spreading wood fern Fern 4
Equisetum arvense Common horsetail Fern 6
Equisetum hyemale Scouringrush horsetail Fern 31
Equisetum hyemale ssp. affine Giant scouring rush Fern 7
Equisetum hyemale var. affine Scouringrush horsetail Fern 4
Equisetum laevigatum Smooth scouring rush Fern 2
Equisetum telmateia Giant horsetail Fern 3
Equisetum telmateia ssp. braunii Giant horsetail Fern 1
Equisetum telmateia var. braunii Giant horsetail Fern 1
Isoetes bolanderi Bolander's quillwort Fern  
Isoetes bolanderi var. pygmaea Bolander's quillwort Fern  
Isoetes echinospora Spiny spored quillwort Fern  
Isoetes howellii Quillwort Fern  
Isoetes nuttallii Nuttall's quillwort Fern  
Isoetes occidentalis Western quillwort Fern  
Isoetes tenella Spiny spore quillwort Fern  
Marsilea vestita Hairy waterclover Fern 6
Marsilea vestita ssp. vestita Hairy pepperwort Fern 5
Myriopteris gracillima Lace lip fern Fern 1
Myriopteris intertexta Coastal lip fern Fern  
Ophioglossum pusillum Northern adder's tongue Fern (rhizomatous)  
Pellaea brachyptera Sierra cliff brake Fern  
Pellaea breweri Brewer's cliff brake Fern  
Pellaea mucronata Bird's foot fern Fern 2
Pentagramma triangularis Gold back fern Fern 3
Pentagramma triangularis ssp. triangularis Gold back fern Fern  
Polypodium californicum California polypody Fern 12
Polypodium calirhiza Licorice fern Fern 3
Polypodium glycyrrhiza Licorice fern Fern 8
Polypodium hesperium Western polypody Fern  
Polystichum californicum California sword fern Fern  
Polystichum imbricans Narrow leaved sword fern Fern 1
Polystichum imbricans ssp. curtum Cliff sword fern Fern  
Polystichum imbricans ssp. imbricans Rock sword fern Fern  
Polystichum kruckebergii Kruckeberg's sword fern Fern (rhizomatous)  
Polystichum lemmonii Lemmon's sword fern Fern 1
Polystichum lonchitis Holly fern Fern (rhizomatous)  
Polystichum munitum Western sword fern Fern 43
Polystichum scopulinum Mountain holly fern Fern  
Pteridium aquilinum Western brackenfern Fern 5
Pteridium aquilinum var. pubescens Western bracken fern Fern  
Selaginella densa Lesser spikemoss Fern (mosslike)  
Selaginella densa var. scopulorum Rocky mountain spike moss Fern (mosslike)  
Selaginella wallacei Wallace's spike moss Fern (mosslike)  
Thelypteris nevadensis Sierra marsh fern Fern  
Woodsia oregana Cliff fern Fern  
Woodsia scopulina Cliff fern Fern  
Woodwardia fimbriata Western chain fern Fern 31
  Lifeform: Shrub365 plants
Acer circinatum Vine maple Tree, Shrub 33
Acer glabrum Mountain maple Tree, Shrub 11
Acer glabrum var. diffusum Mountain maple Tree, Shrub  
Acer glabrum var. glabrum Rocky mountain maple Tree, Shrub  
Acer glabrum var. greenei Greene's mountain maple Tree, Shrub  
Acer glabrum var. torreyi Torrey's mountain maple Tree, Shrub  
Alnus incana Gray alder Tree, Shrub 6
Alnus incana ssp. tenuifolia Creek alder Tree, Shrub 9
Alnus rubra Red alder Tree, Shrub 29
Alnus viridis Green alder Tree, Shrub 1
Alnus viridis ssp. sinuata Sitka alder Tree, Shrub 10
Amelanchier alnifolia Service berry Shrub 31
Amelanchier alnifolia var. pumila Dwarf service berry Shrub  
Amelanchier alnifolia var. semiintegrifolia Service berry Shrub  
Amelanchier pallida Pallid service berry Shrub 3
Amelanchier utahensis Pale leaved serviceberry Shrub 10
Arctostaphylos Xknightii Hybrid manzanita Shrub  
Arctostaphylos glandulosa Eastwood manzanita Shrub 6
Arctostaphylos glandulosa ssp. cushingiana Cushing manzanita Shrub  
Arctostaphylos hispidula Howell's manzanita Shrub  
Arctostaphylos klamathensis Klamath manzanita Shrub  
Arctostaphylos manzanita Common manzanita Shrub 26
Arctostaphylos manzanita ssp. manzanita Common manzanita Shrub 1
Arctostaphylos nevadensis Pine mat manzanita Shrub 6
Arctostaphylos nevadensis ssp. knightii Knight's manzanita Shrub  
Arctostaphylos nevadensis ssp. nevadensis Pine-mat manzanita Shrub  
Arctostaphylos patula Green leaf manzanita Shrub 14
Arctostaphylos viscida Whiteleaf manzanita Tree, Shrub 6
Arctostaphylos viscida ssp. pulchella White leaf manzanita Tree, Shrub  
Arctostaphylos viscida ssp. viscida Smooth white leaf manzanita Tree, Shrub 2
Artemisia arbuscula Black sagebrush Shrub 6
Artemisia arbuscula ssp. arbuscula Low sagebrush Shrub 1
Artemisia arbuscula ssp. thermopola Warm springs low sagebrush Shrub  
Artemisia cana Silver sagebrush Shrub 5
Artemisia cana ssp. bolanderi Bolander's silver sagebrush Shrub  
Artemisia nova Black sagebrush Shrub 4
Artemisia tridentata Common sagebrush Shrub 26
Artemisia tridentata ssp. tridentata Big sagebrush Shrub 3
Artemisia tridentata ssp. vaseyana Mountain sagebrush Shrub 8
Berberis aquifolium Mountain grape Shrub 46
Berberis aquifolium var. aquifolium Oregon grape Shrub 36
Berberis aquifolium var. dictyota Jepson's oregon grape Shrub 3
Berberis aquifolium var. repens Creeping oregon grape Shrub 30
Berberis nervosa Oregon grape Shrub 14
Berberis pinnata Shiny leaf mahonia Shrub 8
Betula glandulosa Resin birch Shrub 6
Betula occidentalis Water birch Tree, Shrub 22
Cassiope mertensiana Western moss heather Shrub 1
Cassiope mertensiana ssp. californica California moss heather Shrub  
Ceanothus Xarcuatus Shrub  
Ceanothus Xlorenzenii Whitethorn x tobacco brush Tree, Shrub  
Ceanothus arcuatus Arching ceanothus Tree, Shrub  
Ceanothus cordulatus Snow bush Shrub 7
Ceanothus cuneatus Buck brush Shrub 24
Ceanothus cuneatus var. cuneatus Buck brush Shrub 3
Ceanothus incanus Coast whitethorn Shrub 1
Ceanothus integerrimus Deer brush Shrub 15
Ceanothus integerrimus var. integerrimus Deer brush Shrub  
Ceanothus integerrimus var. macrothyrsus Deerbrush Shrub 15
Ceanothus lemmonii Lemmon's ceanothus Shrub 3
Ceanothus pinetorum Kern ceanothus Shrub  
Ceanothus prostratus Mahala mats Shrub 11
Ceanothus prostratus var. laxus Large leaved carpet Shrub 11
Ceanothus prostratus var. prostratus Mahala mat Shrub  
Ceanothus pumilus Siskiyou mat Shrub  
Ceanothus sanguineus Red stem ceanothus Shrub 5
Ceanothus thyrsiflorus Blueblossom Tree, Shrub 42
Ceanothus tomentosus Woolly leaf ceanothus Shrub 7
Ceanothus velutinus Tobacco brush, snowbrush Tree, Shrub 11
Ceanothus velutinus var. hookeri Hooker's tobacco brush Tree, Shrub 10
Ceanothus velutinus var. laevigatus Hooker's ceanothus Tree, Shrub 10
Ceanothus velutinus var. velutinus Tobacco brush Tree, Shrub 11
Cercis occidentalis Western redbud Tree, Shrub 66
Cercocarpus betuloides Birch leaf mountain mahogany Tree, Shrub 45
Cercocarpus betuloides var. betuloides Birch leaf mountain mahogany Tree, Shrub 2
Cercocarpus betuloides var. macrourus Few flowered mountain mahogany Tree, Shrub  
Cercocarpus ledifolius Desert mountainmahogany Tree, Shrub 18
Cercocarpus ledifolius var. intercedens Curl leaf mountain mahogany Tree, Shrub  
Cercocarpus ledifolius var. intermontanus Curl leaved mountain mahogany Tree, Shrub  
Cercocarpus ledifolius var. ledifolius Curl leaf mountain mahogany Tree, Shrub  
Chamaebatiaria millefolium Fern bush Shrub 6
Chrysolepis chrysophylla Golden chinquapin Tree, Shrub 4
Chrysolepis chrysophylla var. chrysophylla Golden chinquapin Tree, Shrub 1
Chrysolepis chrysophylla var. minor Bush chinquapin Tree, Shrub  
Chrysolepis sempervirens Sierra chinquapin Shrub 2
Chrysothamnus humilis Truckee rabbitbrush Shrub  
Chrysothamnus nauseosus Common rabbitbrush Shrub 25
Chrysothamnus nauseosus ssp. albicaulis Rubber rabbitbrush Shrub  
Chrysothamnus nauseosus ssp. consimilis Gray rabbitbrush Shrub  
Chrysothamnus parryi Parry's rabbit brush Shrub  
Chrysothamnus parryi ssp. latior Parry's rabbitbrush Shrub  
Chrysothamnus viscidiflorus Green rabbitbrush Shrub 5
Chrysothamnus viscidiflorus ssp. latifolius Sticky leaved rabbitbrush Shrub  
Chrysothamnus viscidiflorus ssp. viscidiflorus Sticky leaved rabbitbrush Shrub  
Cornus glabrata Brown dogwood Tree, Shrub 10
Cornus nuttallii Mountain dogwood Shrub 25
Cornus sericea American dogwood Shrub 43
Cornus sericea ssp. occidentalis Western dogwood Shrub 9
Cornus sericea ssp. sericea Red osier dogwood Shrub 33
Corylus cornuta Beaked hazelnut Shrub 19
Corylus cornuta ssp. californica Beaked hazelnut Shrub 16
Corylus cornuta var. californica California hazelnut Shrub 9
Crataegus columbiana Columbia hawthorn Tree, Shrub 11
Crataegus douglasii Douglas' hawthorn Tree, Shrub 12
Crataegus gaylussacia Klamath hawthorn Tree, Shrub 3
Crataegus suksdorfii Klamath hawthorn Tree, Shrub 3
Cupressus macnabiana Macnab's cypress Tree, Shrub 7
Dasiphora fruticosa Shrubby cinquefoil Shrub 13
Ericameria bloomeri Bloomer's goldenbrush Shrub  
Ericameria greenei Greene's goldenbush Shrub 1
Ericameria nauseosa Rubber rabbitbrush Shrub 25
Ericameria nauseosa var. oreophila Rubber rabbitbrush Shrub  
Ericameria nauseosa var. speciosa Rubber rabbitbrush Shrub  
Ericameria parryi Parry's rabbitbrush Shrub  
Ericameria parryi var. latior Parry's rabbitbrush Shrub  
Ericameria pinifolia Pine bush Shrub 4
Ericameria suffruticosa Heath goldenrod Shrub  
Erigeron concinnus Navajo fleabane Shrub (stem succulent)  
Erigeron concinnus var. concinnus Shaggy daisy Shrub (stem succulent)  
Eriodictyon californicum Yerba santa Shrub 11
Eriogonum congdonii Congdon's buckwheat Shrub  
Eriogonum marifolium Marum leaved buckwheat Shrub  
Eriogonum marifolium var. cupulatum Marum leaved buckwheat Shrub  
Eriogonum marifolium var. marifolium Marum leaved buckwheat Shrub  
Eriogonum microthecum Slender buckwheat Shrub  
Eriogonum microthecum var. ambiguum Obscure buckwheat Shrub  
Eriogonum microthecum var. laxiflorum Bush eriogonum Shrub  
Eriogonum nudum Naked buckwheat Shrub 15
Eriogonum nudum var. nudum Nude buckwheat Shrub 1
Eriogonum nudum var. oblongifolium Oblong leaved buckwheat Shrub 1
Euonymus occidentalis Western burning bush Tree, Shrub 7
Euonymus occidentalis var. occidentalis Western burning bush Tree, Shrub 1
Frangula californica California coffeeberry Shrub 50
Frangula californica ssp. californica California coffeeberry Shrub 43
Frangula californica ssp. occidentalis Wetern california coffeeberry Shrub 2
Frangula purshiana Cascara sagrada Tree, Shrub 19
Frangula purshiana ssp. purshiana Cascara sagrada Shrub 1
Frangula rubra Red buckthorn Shrub 3
Frangula rubra ssp. modocensis Modoc buckthorn Shrub  
Frangula rubra ssp. obtusissima Obtuse buckthorn Shrub  
Frangula rubra ssp. rubra Red buckthorn Shrub 3
Frangula rubra ssp. yosemitana Yosemite buckthorn Shrub  
Fraxinus dipetala Two petaled ash Tree, Shrub 7
Fraxinus jonesii California ash Tree, Shrub 7
Galium porrigens Climbing bedstraw Vine, Shrub  
Galium porrigens var. porrigens Graceful bedstraw Vine, Shrub  
Garrya buxifolia Boxleaf silk tassel Shrub  
Garrya elliptica Coast silk tassel Tree, Shrub 31
Garrya flavescens Ashy silk tassel Shrub 1
Garrya fremontii Fremont's silk tassel Shrub 5
Gaultheria humifusa Alpine wintergreen Shrub  
Gaultheria ovatifolia Western wintergreen Shrub 1
Gaultheria shallon Salal Shrub 25
Glossopetalon spinescens Nevada greasewood Shrub  
Glossopetalon spinescens var. aridum Spiny greasebush Shrub  
Grayia spinosa Hop sage Shrub 7
Hesperocyparis macnabiana Macnab cypress Tree, Shrub 7
Heteromeles arbutifolia Toyon Shrub 63
Holodiscus discolor Oceanspray Shrub 41
Holodiscus discolor var. discolor Oceanspray Shrub 2
Holodiscus discolor var. glabrescens Rock spiraea Shrub 40
Holodiscus discolor var. microphyllus Small-leaf creambush Shrub 1
Holodiscus microphyllus Oceanspray Shrub 40
Holodiscus microphyllus var. glabrescens Rock spiraea Shrub 40
Holodiscus microphyllus var. microphyllus Little leaf creambush Shrub 40
Juniperus californica California juniper Shrub 4
Juniperus communis Common juniper Shrub 14
Juniperus communis var. depressa Common juniper Shrub 2
Juniperus communis var. jackii Common juniper Shrub 2
Juniperus communis var. saxatilis Common juniper Shrub 2
Kalmia polifolia Mountain laurel Shrub 2
Kalmia polifolia ssp. microphylla Bog laurel Shrub 2
Kalmia polifolia ssp. polifolia Mountain laurel Shrub 1
Keckiella breviflora Gaping keckiella Shrub 4
Keckiella breviflora var. breviflora Gaping penstemon Shrub  
Keckiella corymbosa Red beardtongue Shrub 2
Keckiella lemmonii Lemmon's keckiella Shrub  
Ledum glandulosum Western labrador tea Shrub 1
Leptodactylon californicum Prickly phlox Shrub 5
Leptodactylon pungens Prickly phlox Shrub  
Leucothoe davisiae Sierra laurel Shrub 2
Linanthus californicus Prickly phlox Shrub 5
Linanthus pungens Granite prickly phlox Shrub  
Lithocarpus densiflorus Tanbark oak Tree, Shrub 14
Lithocarpus densiflorus var. densiflorus Tanoak Tree, Shrub 3
Lithocarpus densiflorus var. echinoides Tanoak shrub Tree, Shrub 4
Lonicera ciliosa Orange honeysuckle Vine, Shrub 10
Lonicera conjugialis Purpleflower honeysuckle Shrub 3
Lonicera hispidula Pink honeysuckle Vine, Shrub 33
Lonicera hispidula var. vacillans Hairy honeysuckle Vine, Shrub 33
Lonicera interrupta Chaparral honeysuckle Vine, Shrub 5
Lonicera involucrata Coast twinberry Shrub 42
Lonicera involucrata var. involucrata Twinberry Shrub 3
Lonicera involucrata var. ledebourii Coast twinberry Shrub 2
Luetkea pectinata Partridge foot Shrub 3
Lupinus albifrons Silver bush lupine Shrub 34
Lupinus albifrons var. albifrons Silver bush lupine Shrub 5
Lupinus albifrons var. collinus Silver bush lupine Shrub 8
Monardella follettii Follett's monardella Shrub 1
Notholithocarpus densiflorus Tanoak Tree, Shrub 12
Notholithocarpus densiflorus var. densiflorus Tanoak Tree, Shrub 3
Notholithocarpus densiflorus var. echinoides Tanoak shrub Tree, Shrub 4
Oemleria cerasiformis Oso berry Shrub 18
Opuntia fragilis Brittle prickly pear Shrub (stem succulent) 4
Paxistima myrsinites Oregon boxwood Shrub 5
Penstemon sudans Volcanic beardtongue Shrub (stem succulent)  
Philadelphus lewisii Wild mock orange Shrub 47
Philadelphus lewisii ssp. gordonianus Gordon's wild mock orange Shrub 47
Phoradendron bolleanum Bollean mistletoe Shrub (parasitic)  
Phoradendron juniperinum Mistletoe Shrub (parasitic)  
Phoradendron leucarpum American mistletoe Shrub (parasitic)  
Phoradendron leucarpum ssp. tomentosum Mistletoe Shrub (parasitic)  
Phoradendron libocedri Incense cedar mistletoe Shrub (parasitic)  
Phoradendron serotinum Mistletoe Shrub (parasitic)  
Phoradendron serotinum ssp. tomentosum Pacific mistletoe Shrub (parasitic)  
Phoradendron villosum Hairy mistletoe Shrub (parasitic)  
Phyllodoce breweri Brewer's mountain heather Shrub  
Phyllodoce empetriformis Klamath mountain heather Shrub 4
Physocarpus capitatus Ninebark Shrub 40
Potentilla fruticosa Shrubby cinquefoil Shrub 13
Prunus emarginata Bitter cherry Tree, Shrub 15
Prunus subcordata Sierra plum Tree, Shrub 4
Prunus virginiana Chokecherry Tree, Shrub 29
Prunus virginiana var. demissa Western choke cherry Tree, Shrub 10
Prunus virginiana var. melanocarpa Black chokecherry Tree, Shrub 8
Ptelea crenulata Hop tree Tree, Shrub 4
Purshia tridentata Antelope bush Shrub 18
Purshia tridentata var. tridentata Antelope bitterbrush Shrub 18
Quercus sadleriana Sadler oak Shrub 4
Quercus vacciniifolia Huckleberry oak Shrub 5
Rhamnus californica Coffee berry Shrub 61
Rhamnus californica ssp. californica California coffeeberry Shrub 10
Rhamnus californica ssp. occidentalis Wetern california coffeeberry Shrub 2
Rhamnus ilicifolia Evergreen buckthorn Shrub 17
Rhamnus purshiana Cascara sagrada Tree, Shrub 17
Rhamnus rubra Sierra coffeeberry Shrub 3
Rhamnus rubra ssp. rubra Sierra coffeeberry Shrub  
Rhododendron columbianum Western labrador tea Shrub 1
Rhododendron macrophyllum California rose bay Shrub 9
Rhododendron occidentale Western azalea Tree, Shrub 22
Rhododendron occidentale var. paludosum Western azalea Tree, Shrub  
Rhus aromatica Fragrant sumac Shrub 32
Rhus trilobata Skunkbrush Shrub 32
Rhus trilobata var. simplicifolia Single leaf skunkbrush Shrub 7
Ribes aureum Golden currant Shrub 50
Ribes aureum var. aureum Golden currant Shrub 6
Ribes binominatum Trailing gooseberry Shrub  
Ribes bracteosum Stink currant Shrub 6
Ribes cereum Wax currant Shrub 16
Ribes cereum var. cereum Wax currant Shrub 2
Ribes divaricatum Spreading gooseberry Shrub 9
Ribes divaricatum var. parishii Parish's gooseberry Shrub  
Ribes hudsonianum Northern black currant Shrub  
Ribes hudsonianum var. petiolare Western black currant Shrub  
Ribes inerme White stemmed gooseberry Shrub 2
Ribes inerme var. inerme White stemmed gooseberry Shrub  
Ribes inerme var. klamathense Klamath gooseberry Shrub  
Ribes lacustre Swamp currant Shrub 6
Ribes lobbii Gummy gooseberry Shrub 2
Ribes marshallii Marshall's gooseberry Shrub  
Ribes montigenum Mountain gooseberry Shrub 2
Ribes nevadense Mountain pink currant Shrub 11
Ribes quercetorum Oak gooseberry Shrub 2
Ribes roezlii Sierra gooseberry Shrub 10
Ribes roezlii var. cruentum Spiny fruited gooseberry Shrub 3
Ribes roezlii var. roezlii Sierra gooseberry Shrub 3
Ribes sanguineum Flowering currant Shrub 54
Ribes sanguineum var. glutinosum Flowering currant Shrub 25
Ribes sanguineum var. sanguineum Red flowering currant Shrub 7
Ribes velutinum Desert gooseberry Shrub  
Ribes viscosissimum Sticky currant Shrub  
Ribes viscosissimum var. hallii Hall's sticky currant Shrub  
Rosa bridgesii Wood rose Shrub 1
Rosa californica California wild rose Shrub 52
Rosa gymnocarpa Wood rose Shrub 21
Rosa gymnocarpa var. serpentina Gasquet rose Shrub  
Rosa nutkana Nootka rose Shrub 17
Rosa nutkana ssp. macdougalii Nootka rose Shrub  
Rosa pinetorum Pine rose Shrub 1
Rosa pisocarpa Cluster rose Shrub 10
Rosa pisocarpa ssp. ahartii Ahart rose Shrub  
Rosa pisocarpa ssp. pisocarpa Cluster or pea rose Shrub  
Rosa spithamea Sonoma rose Shrub 1
Rosa woodsii Woods' rose Shrub 28
Rosa woodsii ssp. ultramontana Interior rose Shrub 4
Rosa woodsii var. gratissima Tehachapi rose Shrub 2
Rosa woodsii var. ultramontana Wild rose Shrub 4
Rosa yainacensis Cascade rose Shrub 1
Rubus glaucifolius Wax leaf raspberry Shrub  
Rubus lasiococcus Rough fruit berry Vine, Shrub  
Rubus leucodermis White bark raspberry Shrub 8
Rubus parviflorus Thimbleberry Vine, Shrub 37
Rubus parviflorus var. parviflorus Thimbleberry Vine, Shrub 1
Rubus ursinus California blackberry Vine, Shrub 37
Salix boothii Booth's willow Shrub  
Salix delnortensis Del norte willow Shrub  
Salix eastwoodiae Mountain willow Shrub 1
Salix exigua Narrowleaf willow Tree, Shrub 26
Salix exigua var. exigua Narrowleaf willow Tree, Shrub 2
Salix exigua var. hindsiana Sandbar willow Tree, Shrub 25
Salix geyeriana Geyer's willow Shrub 2
Salix hindsiana Sandbar willow Tree, Shrub 25
Salix hookeriana Coastal willow Tree, Shrub 10
Salix jepsonii Jepson's willow Shrub  
Salix lasiandra var. caudata Shining willow Shrub  
Salix lasiolepis Arroyo willow Tree, Shrub 23
Salix lasiolepis var. bigelovii Arroyo willow Tree, Shrub 23
Salix lemmonii Lemmon's willow Shrub 2
Salix ligulifolia Strapleaf willow Shrub  
Salix lucida Shining willow Tree, Shrub 19
Salix lucida ssp. caudata Shining willow Shrub  
Salix melanopsis Dusky willow Tree, Shrub 4
Salix scouleriana Scouler willow Tree, Shrub 17
Salix sitchensis Coulter willow Tree, Shrub 14
Salvia dorrii Dorr's sage Shrub 10
Salvia dorrii var. dorrii Dorr's sage Shrub 2
Salvia dorrii var. incana Fleshy sage Shrub  
Salvia dorrii var. pilosa Hairy sage Shrub  
Sambucus melanocarpa Black elderberry Shrub 3
Sambucus mexicana Elderberry Tree, Shrub 40
Sambucus nigra Black elderberry Shrub 13
Sambucus nigra ssp. caerulea Blue elderberry Shrub 60
Sambucus racemosa Red elderberry Shrub 31
Sambucus racemosa var. melanocarpa Rocky mountain elder Shrub 3
Sambucus racemosa var. microbotrys Red elderberry Shrub 3
Sambucus racemosa var. racemosa Red elderberry Shrub 5
Sarcobatus vermiculatus Greasewood Shrub 3
Shepherdia canadensis Russet buffaloberry Tree, Shrub 4
Solanum parishii Parish's purple nightshade Shrub 3
Solanum umbelliferum Blue witch Shrub 10
Sorbus californica California mountain ash Shrub 1
Sorbus scopulina Mountain ash Shrub 7
Sorbus scopulina var. cascadensis Cascade mountain ash Shrub 7
Sorbus scopulina var. scopulina Mountain ash Shrub  
Sorbus sitchensis Western mountain ash Tree, Shrub 5
Sorbus sitchensis var. grayi Sitka mountain ash Tree, Shrub  
Sorbus sitchensis var. sitchensis Sitka mountain ash Tree, Shrub  
Spiraea densiflora Dense flowered spiraea Shrub 17
Spiraea densiflora ssp. splendens Mountain spirea Shrub 5
Spiraea douglasii Douglas spiraea Shrub 26
Spiraea splendens Rose meadowsweet Shrub 17
Staphylea bolanderi Bladdernut Tree, Shrub 1
Symphoricarpos acutus Creeping snowberry Shrub 17
Symphoricarpos albus Common snowberry Shrub 42
Symphoricarpos albus var. laevigatus Snowberry Shrub 12
Symphoricarpos hesperius Creeping snowberry Shrub 17
Symphoricarpos mollis Snowberry Shrub 18
Symphoricarpos rotundifolius Mountain snowberry Shrub 3
Symphoricarpos rotundifolius var. parishii Parish's snowberry Shrub  
Symphoricarpos rotundifolius var. rotundifolius Snowberry Shrub  
Tetradymia canescens Gray horsebrush Shrub 1
Tetradymia glabrata Little leaf horsebrush Shrub  
Toxicodendron diversilobum Poison oak Vine, Shrub 7
Vaccinium cespitosum Dwarf bilberry Shrub 2
Vaccinium coccineum Siskiyou Mtns. huckleberry Shrub 5
Vaccinium deliciosum Cascade bilberry Shrub (stem succulent)  
Vaccinium membranaceum Thin leaf huckleberry Shrub 5
Vaccinium ovatum Evergreen huckleberry Shrub 38
Vaccinium parvifolium Red huckleberry Shrub 11
Vaccinium scoparium Little leaf huckleberry Shrub 1
Vaccinium uliginosum Blueberry Shrub 2
Vaccinium uliginosum ssp. occidentale Western blueberry Shrub 2
Viburnum edule Squashberry Shrub 4
Vitis californica California wild grape Vine, Shrub 39
Whipplea modesta Modesty Vine, Shrub 7
  Lifeform: Tree74 plants
Abies Xshastensis Shasta red fir Tree  
Abies amabilis Lovely fir Tree 6
Abies concolor White fir Tree 22
Abies grandis Grand fir Tree 16
Abies lasiocarpa Subalpine fir Tree 11
Abies lasiocarpa var. lasiocarpa Subalpine fir Tree  
Abies magnifica Magnificant silver fir Tree 3
Abies magnifica var. magnifica California red fir Tree  
Abies magnifica var. shastensis Shasta red fir Tree  
Abies procera Noble fir Tree 14
Acer macrophyllum Bigleaf maple Tree 52
Acer negundo Boxelder Tree 30
Acer negundo var. californicum California box elder Tree 30
Acer negundo var. interius Boxelder Tree 27
Alnus rhombifolia White alder Tree 38
Arbutus menziesii Madrono Tree 35
Callitropsis bakeri Modoc cypress Tree 2
Callitropsis nootkatensis Alaska cedar Tree 10
Calocedrus decurrens Incense cedar Tree 40
Chamaecyparis lawsoniana Port orford cedar Tree 14
Cupressus bakeri Baker's cypress Tree 7
Cupressus lawsoniana Port orford cedar Tree 14
Cupressus nootkatensis Alaska cedar Tree 1
Fraxinus latifolia Oregon ash Tree 29
Hesperocyparis bakeri Baker's cypress Tree 7
Juglans californica var. hindsii Northern california black walnut Tree 13
Juglans hindsii Northern california black walnut Tree 13
Juniperus grandis Sierra juniper Tree  
Juniperus occidentalis Western juniper Tree 2
Juniperus occidentalis var. australis Sierra juniper Tree  
Juniperus occidentalis var. occidentalis Western juniper Tree 2
Picea breweriana Weeping spruce Tree 1
Picea engelmannii Engelmann spruce Tree 7
Pinus albicaulis Whitebark pine Tree 1
Pinus attenuata Knobcone pine Tree 6
Pinus balfouriana Foxtail pine Tree 1
Pinus balfouriana ssp. balfouriana Klamath foxtail pine Tree  
Pinus contorta Lodgepole pine Tree 30
Pinus contorta ssp. bolanderi Bolander's beach pine Tree 1
Pinus contorta ssp. murrayana Lodgepole pine Tree 4
Pinus jeffreyi Jeffrey pine Tree 17
Pinus lambertiana Sugar pine Tree 13
Pinus monticola Western white pine Tree 10
Pinus ponderosa Yellow pine Tree 29
Pinus ponderosa var. ponderosa North plateau ponderosa pine Tree 2
Pinus ponderosa var. washoensis Washoe pine Tree  
Pinus sabiniana Gray pine Tree 28
Pinus washoensis Washoe pine Tree  
Populus balsamifera ssp. trichocarpa Black cottonwood Tree 27
Populus fremontii Fremont cottonwood Tree 32
Populus fremontii ssp. fremontii Cottonwood Tree 4
Populus tremuloides Quaking aspen Tree 28
Populus trichocarpa Black cottonwood Tree 27
Pseudotsuga menziesii Douglas fir Tree 31
Pseudotsuga menziesii var. menziesii Douglas fir Tree 4
Quercus Xmorehus Oracle oak Tree 1
Quercus chrysolepis Gold cup live oak Tree 24
Quercus chrysolepis var. nana Canyon live oak Tree 25
Quercus garryana Oregon oak Tree 24
Quercus garryana var. breweri Oregon oak Tree 2
Quercus garryana var. garryana Oregon oak Tree 1
Quercus garryana var. semota Oregon white oak Tree  
Quercus kelloggii California black oak Tree 24
Salix bebbiana Gray willow Tree 2
Salix laevigata Polished willow Tree 17
Salix lasiandra Pacific willow Tree 20
Salix lasiandra var. lasiandra Pacific willow Tree 6
Salix lucida ssp. lasiandra Shining willow Tree 6
Taxus brevifolia California yew Tree 11
Taxus brevifolia var. brevifolia Tree 11
Taxus brevifolia var. reptaneta Pacific yew Tree 11
Tsuga heterophylla Western hemlock Tree 14
Tsuga mertensiana Patton spruce Tree 13
Umbellularia californica California bay Tree 40
  Lifeform: Vine2 plants
Cuscuta howelliana Boggs lake dodder Vine  
Rubus nivalis Snow dwarf bramble Vine  
 
Pink background indicates a plant is non-native.
! indicates a plant is potentially invasive.
NB: found in Siskiyou 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.