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General:
Perennial, aquatic herb from fibrous roots; stems compressed, branched, up to 150 cm long.
Leaves:
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.
Flowers:
Inflorescence spikelike, the spikes 2.5-4 cm long, with 3 to 5 whorls of flowers, the stalks thin.
Fruits:
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.
Notes:
Stem anatomical characters Interlacunar and subepidermal bundles absent, pseudohypodermis 1 cell thick, endodermis of O-cells.
Source: The Illustrated Flora of British Columbia
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