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Perennial, aquatic herb from fibrous roots; stems compressed, branched, up to 150 cm long.
All submersed, narrowly oblong with parallel sides, 1-10 cm long, 0.4-1 cm wide, with 9 to 35 veins, attached at the nodes, the tips rounded, the bases rounded and toothed, the margins wavy, with tiny teeth, dark green and crispy, stipules inconspicuous, 0.5 cm long.
Inflorescence spikelike, the spikes 2.5-4 cm long, with 3 to 5 whorls of flowers, the stalks thin.
Achenes, lanceolate, 5-6 mm long (including the beaks), 2-2.3 mm wide, the beaks 2-3 mm long, prominent, pointed, the keels well-developed, toothed.
Stem anatomical characters Interlacunar and subepidermal bundles absent, pseudohypodermis 1 cell thick, endodermis of O-cells.
Source: The Illustrated Flora of British Columbia