swamp rose mallow swamp·ro·se·mallow uncommon noun 1. showy shrub of salt marshes of the eastern United States having large rose-colored flowers Synonymsrose mallowswamp mallowcommon rose mallowswamp rose mallowHibiscus moscheutos Related words Broader terms hibiscus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
