Pantropical floating plant forming a rosette of wedge-shaped leaves

• A widespread weed in rivers and lakes

Wikipedia Word definitions in Wikipedia
Pistia is a genus of aquatic plant in the arum family, Araceae . The single species it comprises, Pistia stratiotes , is often called water cabbage , water lettuce , Nile cabbage , or shellflower . Its native distribution is uncertain, but probably pantropical ...

WordNet Word definitions in WordNet
n. pantropical floating plant forming a rosette of wedge-shaped leaves; a widespread weed in rivers and lakes [syn: water lettuce , water cabbage , Pistia stratiotes , Pistia stratoites ]