perennial ragweed

Thesaurus

Noun

1.perennial ragweed - coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and MexicoAmbrosia psilostachya, western ragweedambrosia, bitterweed, ragweed - any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma