/ Thesaurus / B Synonyms of burweed marsh elder Find synonyms for: Noun1. burweed marsh elder, false ragweed, Iva xanthifolia, marsh elder, ivausage: tall annual marsh elder common in moist rich soil in central North America that can cause contact dermatitis; produces much pollen that is a major cause of hay feverWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language