Sparganium fluctuans (Morong) B.L.Rob.
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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 - Stem slender and elongate, to 15 dm; lvs floating, flat, thin and translucent, 3–10 mm wide, cross-reticulate beneath; infl often branched; pistillate heads 2–4, chiefly on the branches, sessile or short-peduncled, 1.5–2 cm thick when ripe; tep linear- oblong, reaching the middle of the achene, attached at or below the middle of the short (2–4 mm) stipe; achene dark reddish-brown, the body obovoid-oblong, 3–4 mm, obscurely constricted just below the middle, rounded above into a stout curved beak 2–3 mm; staminate heads several on the central axis, 1 or 2 on the branches. In quiet water; Nf. and Que. to Minn., s. to Conn., Pa., and Mich.