Plant Communities: wetland-riparian
Synonyms: Lemna polyrrhiza Spirodela polyrhiza Spirodela polyrrhiza var. masonii
Counties: Butte Glenn Humboldt Inyo Lake Lassen Marin Mendocino Merced Mono Modoc Plumas San Bernardino Santa Cruz San Francisco Shasta Sierra Siskiyou Solano Sonoma Stanislaus Tuolumne