Sparganium emersum Rehmann
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Typhaceae
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Scientific Name
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Description
Species Description - Much like no. 5 [Sparganium angustifolium Michx.], but with broader (6–12 mm), flat, more coarsely veined lvs, the basal ones ± V-shaped in section below; bracts and upper lvs not dilated at base except by the scarious margins; pistillate heads 1.5–2(–2.5) cm thick when ripe; 2n=30. In quiet water; circumboreal at high latitudes, s. to N. Engl., N.Y., Man., Colo., and Calif. Our plants, and most others from the conterminous U.S. and s. Can., belong to var. multipedunculatum (Morong) Reveal. (S. multipedunculatum) The more boreal and Eurasian var. emersum is more emergent, with larger heads and more keeled basal lvs. (S. simplex)