Cirsium butleri (Rydberg) Petrak
Cirsium butleri (Rydberg) Petrak is a synonym sensu FNA Ed. Comm., 2006a of:
Cirsium scariosum Nuttall var. scariosum, an accepted variety name sensu FNA Ed. Comm., 2006a.
Cirsium butleri (Rydberg) Petrak is a synonym sensu FNA Ed. Comm., 2006a of:
Cirsium scariosum Nuttall var. scariosum, an accepted variety name sensu FNA Ed. Comm., 2006a.