/ Thesaurus / O Synonyms of oenothera biennis Find synonyms for: Noun1. common evening primrose, German rampion, Oenothera biennis, evening primroseusage: a coarse biennial of eastern North America with yellow flowers that open in the evening; naturalized in EuropeWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language