Limnobium spongia
American frogbit, American spongeplant, frogbite
branched;
stolon buds with 10 or more roots.
floating or emersed in dense vegetation and when stranded;
blade 1–10 × 0.9–7.8 cm;
primary veins forming 30–80° angle with midvein, ascending, aerenchyma extensive, nearly margin to margin, individual aerenchyma space (located ca. 1 mm from either side of midvein) , 0.4–1.6 mm wide, 1 mm from midveinacross its longest axis.
staminate flowers with 9–12(–18) stamens; pistillate flowers with 3–4 petals;
ovary 6–9-carpellate, locules 6–9;
styles 2-fid nearly to base;
ovules 200.
4–12 mm diam.
Limnobium spongia
No specimens have been seen from New Jersey, but although the species is to be expected there.
Limnobium spongia has two leaf forms, often on the same plant. The floating leaves have a thick layer of aerenchyma on the abaxial surface; the emersed leaves lack such tissue. Flowering and fruiting are predominantly on individuals with emersed leaves. Following pollination, the peduncle becomes recurved, forcing the developing fruit below the water surface.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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