Barkley - 1490 - United States
Berlandier - 2509 - United States
Blankinship - s.n. - United States
Cirsium undulatum
Clemens - 11853 - United States
Davidse - 39487 - United States
Emig - 628 - United States
Emig - 741 - United States
Fendler - 74 - United States
Hinton - 17927 - Mexico
Hinton - 18561 - Mexico
Hinton - 20246 - Mexico
Hinton - 20470 - Mexico
Hinton - 20968 - Mexico
Hubricht - B1393 - United States
Muehlenbach - 1254 - United States
Semple - 270 - United States
Waugh - s.n. - United States
Yatskievych - 17-093 - United States