water plantain

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various aquatic plants of the genus Alisma, having narrow to ovate leaves and branched panicles with whorls of small flowers.

from The Century Dictionary.

• noun A plant of the genus Alisma, chiefly A. Plantago, the common or great water-plantain, growing in shallow water throughout the temperate northern hemisphere, reappearing in Australia.

from the GNU version of the Collaborative International Dictionary of English.

• (Bot.) A kind of plant with acrid leaves. See under 2d plantain.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of several plants, of the genus Alisma, that inhabit marshy places

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun marsh plant having clusters of small white or pinkish flowers and broad pointed or rounded leaves