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Agricultural Research Service
U.S. Department of Agriculture

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Cirsium undulatum

Cirsium undulatum (Nutt.) Spreng.  
Family: Asteraceae
[Carduus undulatus Nutt., moreCirsium megacephalum (A. Gray) Cockerell ex Daniels, Cirsium undulatum var. megacephalum (A. Gray) Fernald, Cnicus undulatus (Nutt.) A. Gray, Cnicus undulatus var. megacephalus A. Gray]
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