General: Perennial, aquatic herb from long rhizomes; stems lax, usually floating, 30-40 cm tall.
Leaves: Alternate, limp, not keeled, usually floating, linear with sheathing bases, 100-120 cm long, 2-6 (8) mm wide.
Flowers: Inflorescence simple, of 2 to 4 female heads below and 2 to 5 (8) male heads above, the heads globe-shaped, the female heads 1-2 cm wide, at least some borne above the leaf axils and subtended by conspicuous leaflike bracts; perianth segments 6, scalelike, attached near the top of the flower stalk; stigma 1; anthers about 1 mm long, 0.5 mm wide.
Fruits: Achenes, 3-7 mm long, constricted at the middle, reddish to brownish at base prior to drying, beaked, the beaks 1.5-2.2 mm long, straight or slightly curved, the stalks 1-1.5 mm long; seeds 1.
Notes: This is a highly variable species in which different forms are often treated as species (e.g., Hitchcock and Cronquist 1973) or infraspecific taxa (e.g., Brayshaw 1985). Packer (1983b) has shown that there is no justification for recognizing more than a single, variable species, at least until adequate research has shown otherwise.
Ponds, ditches and lakeshores in the lowland, steppe and montane zones; common throughout BC; circumpolar, N to AK, YT and NT, E to NF and S to ME, MA, NY, PA, VA, IN, MN, NM, AZ and CA; Greenland, Europe.
Sparganium angustifolium var. multipedunculatum Sparganium emersum var. angustifolium (Michx.) Roy L. Taylor & MacBryde Sparganium emersum var. multipedunculatum (Morong) Reveal Sparganium multipedunculatum (Morong) Rydb. Sparganium simplex var. multipedunculatum
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:
2021-04-16 7:02:46 PM
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