Synonyms
Cirsium breweri (A.Gray) Jeps.
Cirsium breweri var. lanosissimum Petr.
Cirsium breweri var. canescens Petr.
Cirsium breweri var. glutinosum Petr.
Cirsium douglasii var. canescens (Petr.) J.T.Howell
Cnicus breweri A.Gray
Carduus breweri (A.Gray) Greene