| NOUN | plant | perennial ragweed, western ragweed, Ambrosia psilostachya | coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico |
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| Meaning | coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico. | |
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| Synonyms | western ragweed, Ambrosia psilostachya | |
| Broader | ragweed, ambrosia, bitterweed | Any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma |
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