water plantain

any of a family (Alismataceae, order Alismatales) of hardy, monocotyledonous water plants with large, heart-shaped leaves and small, usually white, flowers

See water plantain in American Heritage Dictionary 4

noun
Any of various aquatic herbs of the genus Alisma, having panicles with whorled branches and small three-petaled white or pinkish flowers.

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