Coefficient of Conservatism:
Coefficient of Wetness:
M. R. Penskar
In shallow quiet water at depths up to 1.5 m, rarely stranded on adjacent shores.
Normally easily recognized by the long, very narrow floating leaves (usually 2–3 mm wide, occasionally as wide as 5 mm or sheathing portions at base of plant even wider), and small supra-axillary heads of shiny, usually greenish achenes. The sepals are attached near the base of the stalk, especially in a low, semi-terrestrial form with rather curved beaks, which will run in most keys to S. fluctuans because of these characters. It differs from the latter species in its very narrow leaves, shiny, light brown to green, slightly smaller achenes, long sepals, supra-axillary heads, and unbranched inflorescence.