General: Perennial, aquatic herb from weak rhizomes; stems floating, 20-60 cm tall.
Leaves: Alternate, limp, unkeeled, flat, floating, linear with sheathing bases, 40-60 cm long, 2-8 mm wide.
Flowers: Inflorescence simple, of 1 to 3 female heads below and 1 male head above, the heads globe-shaped, the female heads 0.5-1.2 cm wide, axillary, sometimes borne above the leaf axils, usually unstalked or sometimes stalked below; perianth segments 6, attached near the top of the flower stalk; stigma 1; anthers less than 0.8 mm long.
Fruits: Achenes, 2-4 mm long, barely or not constricted at the middle, beaked, the beaks 0.5-1.5 mm long, curved; seeds 1.
Ponds, lakeshores and slow-moving streams in the lowland and montane zones; common throughout all but NW BC; circumpolar, N to AK, YT and NT, E to NF and S to ME, MA, NY, IN, MN, CO, AZ and CA; Eurasia.
Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC:
Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for
Advanced Spatial Analysis, Department of Geography, University of British
Columbia, Vancouver. [Accessed:
2021-12-01 4:14:24 AM
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