/ Thesaurus / S Synonyms of swamp milkweed Find synonyms for: Noun1. swamp milkweed, Asclepias incarnata, milkweed, silkweedusage: densely branching perennial of the eastern United States with white to crimson or purple flowersWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language