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Lathyrus palustris lapa lvd. en Lathyrus palustris nl Moeraslathyrus usda gov imageID lapaavd tif USDANRCS PLANTS Database Britton and Brown An illustrated flora of the northern United States Canada and the British Possessions vols Charles Scribner's Sons New York Vol USDA NRCS The PLANTS Database usda gov September National