1. American plant with roundish heart-shaped or kidney-shaped leaves; usually rooted in muddy bottoms of ponds and ditches; [syn: American frogbit, Limnodium spongia]
WordNet (r) 3.0 (2006):
American frogbit
n 1: American plant with roundish heart-shaped or kidney-shaped
leaves; usually rooted in muddy bottoms of ponds and
ditches [syn: American frogbit, Limnodium spongia]