Potamogeton robbinsii
Robbins' pondweed
Family: Potamogetonaceae · Type: perennial · Native
Conservation status: CNPS 2B.3
Robbins' pondweed is a native perennial aquatic plant found in the Klamath Ranges and central Sierra Nevada Mountains in deep water and lake habitats at elevations of 1,600 to 3,300 meters. Flowering from August to September, this submersed plant produces small, inconspicuous flowers in compact clusters less than 2 centimeters long. Growing with flexible stems up to 200 centimeters long and many branches, it forms dense underwater meadows with multiple cylindrical stems. Its leaves are narrow and linear to lanceolate, typically 3 to 4 millimeters wide, stiff and arranged in two ranks with 20 to 60 fine veins, and finely serrated along the edges. The plant's distinctive stipules are fibrous, fused to the leaf base, and range from green-brown to white, often shredding at the tips.
Habitat: Deep water, lakes
Bloom period: Aug-Sep
Elevation: 1600-3300 m
Bioregions: KR, c&s SNH
California counties: Inyo, Madera, Siskiyou, El Dorado, Alpine, Tuolumne, Mono, Fresno, Santa Barbara
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Jepson eFlora, Cal-IPC, and more.