perennial ragweed


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Noun1.perennial ragweed - coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexicoperennial ragweed - coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
ambrosia, 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