General:
Perennial, aquatic or semi-terrestrial herb from strong rhizomes; stems up to 100 cm long, flattened, compressed, usually not branched.

Leaves:
Submersed leaves ribbon-like, thin, the sides parallel, whitish-green, 1-20 cm long, 3-7 mm wide, unstalked, the tips pointed, with broad translucent bands along the midveins (totalling about 1/3 of the leaf width) and with 3 to 13 veins, the stipules 0.5-3 cm long, inconspicuous; floating leaves 1-7 cm long, 0.5-2 cm wide, leathery, long-stalked, lanceolate to elliptic, the tips pointed, tapering at the bases.

Flowers:
Inflorescence spikelike, the spikes 2-4 cm long, with 5 to 12 whorls of flowers, the stalks thin.

Fruits:
Achenes, almost globe-shaped, 2.5-4.5 mm long, 2-3 mm wide, flattened, beakless, the keels pronounced, winged.

Source:  The Illustrated Flora of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  The Illustrated Flora of British Columbia

Flower Colour:
Green

Blooming Period:
Mid Summer

Fruit/Seed characteristics:
Colour: Brown
Present from Summer to Fall

Source:  The USDA

Synonyms and Alternate Names:
Potamogeton epihydrus subsp. nuttallii (Cham. & Schltdl.) Calder & Roy L. Taylor
Potamogeton epihydrus var. nuttallii (Cham. & Schltdl.) Fernald
Potamogeton epihydrus var. ramosus (Peck) House
Potamogeton nuttallii