Cirsium pumilum subsp. hillii (Canby) R.J. Moore & C. Frankton
Cirsium pumilum subsp. hillii (Canby) R.J. Moore & C. Frankton is a synonym sensu FNA Ed. Comm., 2006a of:
Cirsium pumilum var. hillii (Canby) B. Boivin, an accepted variety name sensu FNA Ed. Comm., 2006a.