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Cirsium tracyi (Rydb.) Petr.  
Family: Asteraceae
Tracy's thistle
[Carduus tracyi Rydb., moreCirsium acuatum (Osterh.) Petr., Cirsium floccosum (Rydb.) Petr., Cirsium undulatum var. tracyi (Rydb.) S.L. Welsh]
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