Perennial aquatic herb from a fibrous root; flowering stems several, branched at the nodes.
Stem leaves in whorls of 3 or the lowest opposite, broadly lanceolate to oblong or egg-shaped, rounded at the tips, 6-17 mm long, 1-4 mm wide, minutely sharp-toothed.
Inflorescence of either male or female, axillary, long-stalked, solitary flowers; petals 3, white, lanceolate, 4.5-5 mm long (male) or, 2-3 mm long (female); sepals 3, greenish, elliptic, 3.5-5 mm long (male) or 2-3 mm long (female); stamens 9.
Capsules, cylindric or egg-shaped, about 6 mm long; seeds several, 4-5 mm long, smooth.
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
Present from Summer to Fall
Source: The USDA
||Value / Class
Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
of field plots
species was recorded in:
BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in
Source: Klinkenberg 2013
Synonyms and Alternate Names:
Anacharis canadensis (Michx.) Planch.
Anacharis canadensis var. planchonii (Caspary) Victorin
Elodea brandegeeae H. St. John
Elodea ioensis Wylie
Elodea linearis (Rydb.) H. St. John
Elodea planchonii Caspary
Philotria canadensis (Michx.) Britt.
Philotria linearis Rydb.