General: Perennial, aquatic herb from long rhizomes; stems usually submerged, 80-150 cm tall.
Leaves: Alternate, limp, unkeeled, usually floating, linear, ribbon-like, 60-100 cm long, 3-11 mm wide.
Flowers: Inflorescence branched, of 2 to 4 female heads below and 1 to 6 male heads above, the heads globe-shaped, unstalked, the female heads 1.5-2.3 cm wide, axillary and subtended by conspicuous leaflike bracts; perianth segments 6, spoonlike, often with a dark spot at the tips, attached near the base of the flower stalk; stigma 1; anthers about 0.4-0.8 mm long.
Fruits: Achenes, 2-5 mm long, unstalked, more or less constricted at the middle, beaked, the beaks 2-3.5 mm long, curved; seeds 1.
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:
2021-01-24 5:05:23 PM
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