a creeping, Eurasian annual plant, Lythrum portula, of marshes and wetlands, having small flowers and rounded leaves.
an aquatic herb, Peplis diandra, of the central U.S. and Mexico, having small flowers.
a widely distributed herb, Ludwigia palustris, of marshes and wetlands, having small flowers.
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British Dictionary definitions for water purslane
an onagraceous marsh plant, Ludwigia palustris, of temperate and warm regions, having reddish stems and small greenish flowers
any of several lythraceous plants of wet places that resemble purslane, such as Peplis portula of Europe, which has small pinkish flowers, and Didiplis diandris of North America, which has small greenish flowers
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012