Stuckenia filiformis subsp. alpina

Slender-leaved pondweed, Slender-Leaved Pondweed

Family: Potamogetonaceae · Type: perennial · Native

Conservation status: CNPS 2B.2

Slender-leaved pondweed is a rare (CNPS 2B.2) California native perennial found in the Klamath Ranges, central Sierra Nevada, Great Valley, Central Coast, San Francisco Bay Area, and Great Basin in shallow, clear water of lakes and drainage channels at elevations of 300 to 2,150 meters. Flowering from May to July, this aquatic plant produces small, inconspicuous flowers in terminal whorls. Growing with slender, branching stems less than 65 centimeters tall that emerge from rhizomes and tubers, it develops a delicate underwater structure. Its narrow leaves are linear to bristle-like, less than 12 centimeters long and less than 3 millimeters wide, with distinctive notched or blunt rounded tips. Small fruits approximately 2 to 3 millimeters long are produced with an inconspicuous beak.

Habitat: Shallow, clear water of lakes, drainage channels

Bloom period: May-Jul

Elevation: 300-2150 m

Bioregions: KR, c SNH, GV, CCo, SnFrB, GB

California counties: Contra Costa, Humboldt, Siskiyou, Lassen

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Jepson eFlora, Cal-IPC, and more.