Any of various aquatic plants of the genus Alisma, having narrow to ovate leaves and branched panicles with whorls of small flowers.
Any of a family (Alismataceae, order Alismatales) of hardy, monocotyledonous water plants with large, heart-shaped leaves and small, usually white, flowers.
Any of several plants
, of the genus Alisma
, that inhabit marshy places.