water pepper

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water pepper

n.
Either of two smartweeds that grow in moist habitats, Persicarea hydropiper, which has acrid-tasting leaves, or P. hydropiperoides, which has milder leaves.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

water pepper

n
(Plants) any of several polygonaceous plants of the genus Polygonum, esp P. hydropiper, of marshy regions, having reddish stems, clusters of small greenish flowers, and acrid-tasting leaves
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014