Click on the image below to view an
expanded illustration for this species.
|
General:
Perennial, aquatic herb from strong rhizomes; stems up to 100 cm long, branched.
Leaves:
Submersed leaves reduced to narrow, firm, cylindrical stalks without blades, growing from the branches of the main stem, 5-15 cm long, the stipules 2-4 cm long, delicate, shredded with age; floating leaves egg-shaped, 3-5 cm long, 1-3 cm wide, the larger ones with 9 to 19 veins, leathery, long-stalked, the tips rounded, rounded or tapering at the bases.
Flowers:
Inflorescence spikelike, the spikes 1.5-3 cm long, with 3 to 8 whorls of flowers, the stalks slightly inflated.
Fruits:
Achenes, widely egg-shaped, 2.5-3.5 mm long, 2-2.4 mm wide, the beaks cylindrical, the keels obscure, developed in the upper half of achenes.
Notes:
Stem anatomical characters Interlacunar bundles strongly developed in the outer interlacunar circle of aerenchyma with some bundles scattered in the neighbouring circles, subepidermal bundles absent, pseudohypodermis absent or 1 cell thick, endodermis of U-cells.
Source: The Illustrated Flora of British Columbia
|
