Boufford - 16009 - United States
Breedlove - 21278 - Mexico
Chan V. - 1981 - Mexico
Cirsium horridulum
Croat - 40667 - Mexico
Harmon - 2165 - Guatemala
Martínez Salas - 15458 - Mexico
McVaugh - 23501 - Mexico
Pruski - 3976 - United States
Pruski - 3981 - United States
Pruski - 4577 - United States
Pruski - 4580 - United States
Téllez Valdés - 7854 - Mexico
Véliz Pérez - 98.6125 - Guatemala
Véliz Pérez - s.n. - Guatemala