water lettuce

English Thesaurus

1. pantropical floating plant forming a rosette of wedge-shaped leaves; a widespread weed in rivers and lakes (noun.plant)

hypernym	:	aquatic plant, hydrophyte, hydrophytic plant, water plant,
definition	:	a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth (noun.plant)

member meronym	:	genus pistia,
definition	:	one species: water lettuce (noun.plant)