Butomus umbellatus L.
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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
Butomaceae
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Scientific Name
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Description
Species Description - Lvs basal, erect, floating, or submersed in water up to several m deep, linear, to 1 m, 5–10 mm wide; scape 1–1.5+ m; fls numerous, 2–2.5 cm wide, on pedicels 5–10 cm; 2n=20, 26, 39. Native of Eurasia, thoroughly established on shores and riverbanks in the St. Lawrence R. valley and in Lake Champlain, and more recently spread inland, even to N.D., S.D., Mont., and Ida. June–Aug.