Ambrosia artemisiifolia
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| Noun | 1. |  Ambrosia artemisiifolia - annual weed with finely divided foliage and spikes of green flowers; common in North America; introduced elsewhere accidentallyambrosia, 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 |
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