Limnobium spongia (Bosc) Steud.
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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
Hydrocharitaceae
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Scientific Name
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Description
Species Description - Lf-blades broadly ovate (especially when emergent) to deeply cordate-orbicular but usually acute, 3–7 cm long and wide, 5–7-veined, the lateral veins arcuate- ascending; floating lvs aerenchymatous and spongy toward the base beneath; pedicels 3–10 cm; pet white, linear or linear-oblong, ca 1 cm, not much longer than the slender sep; anthers elongate, ca 3.5 mm; stigmas conspicuous, 10–15 mm; fr 4–12 mm thick. In ponds and bayous; trop. Amer., n. along the Atlantic coastal plain to N.J. and up the Mississippi embayment to s. Ill.; also in n. Ind. and w. N.Y. June–Sept.
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Common Names
American frog-bit