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Related to water pepper: Persicaria hydropiper
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.
(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