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Perennial, aquatic herb from strong rhizomes; stems up to 200 cm long, usually branched.
Submersed leaves elliptical to widely lanceolate, thin, flat, intense yellow-green, 8-20 cm long, 2-5 cm wide, with 7 to 19 veins, the tips sharp-pointed, tapering into long stalks at the bases, the stalks less than 2 cm long, the stipules 2.5-8 cm long; floating leaves often absent, if present elliptical, 5-20 cm long, 2-7 cm wide, leathery, long-stalked, the tips pointed, tapering at the bases.
Inflorescence spikelike, the spikes with 8 to 15 whorls of flowers, the stalks thick, inflated.
Achenes, widely egg-shaped or almost globe-shaped, 2.5-3.6 mm long, 2.1-3 mm wide, the beaks widely triangular, the keels wide.
Stem anatomical characters Interlacunar bundles strongly developed in 1 circle, often with few additional bundles in neighbouring circles, subepidermal bundles usually absent, pseudohypodermis absent or 1 cell thick, endodermis of U-cells.
Source: The Illustrated Flora of British Columbia