giant ragweed ambrosia trifida flowers asteraceae annual wind pollinated flower |
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navigate by keyword : giant ragweed flowers ambrosia trifida allergy hay fever yellow buffalo weed great landscape wild grass allergic allergenic blooming field allergen pollen cluster leaves detail bloom autumn health care dangerous flower pollination wind nature plant green garden natural outdoor fresh summer background beautiful closeup |
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Giant ragweed ( Ambrosia trifida ) flowers. Asteraceae annual wind-pollinated flower. The male flowers on long spikes scatter large amounts of pollen, which is the cause of autumn hay fever. |
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