Heteranthera rotundifolia (Kunth) Griseb.
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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
Pontederiaceae
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Scientific Name
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Description
Species Description - Much like no. 3 [Heteranthera limosa (Sw.) Willd.]; aerial lvs with floating or emergent, relatively broad and blunt blade, commonly nearly or fully as broad as long, obtuse or rounded above, rounded or subcordate at base; spathe closely clasping the fl; perianth-segments 3 above, 2 lateral and spreading, and one below, the central upper one with lateral flanges in the proximal one-fourth; lateral stamens with distally incurved filaments; 2n=14. Exposed mud-flats or in shallow water of ephemeral pools, roadside ditches, and small ponds; Mississippi R. drainage from Ky. to S.D., s. to S. Amer., and in s. Ariz. and w. Mex.