Cnicus undulatus Gray var. megacephalus Gray

Cirsium undulatum (Nutt.) Spreng. var. megacephalum (Gray) Fern.

Cirsium helleri (Small) Cory

Cirsium megacephalum (Gray) Cockerell

Cirsium ochrocentrum Gray var. helleri (Small) Petrak

Carduus helleri Small

Carduus undulatus Nutt.

Chihuahuan Desert

Southern Shortgrass Prairie

Edwards Plateau

Crosstimbers and Southern Tallgrass Prairie

Archer

Armstrong

Bailey

Bandera

Bell

Brewster

Brown

Burnet

Carson

Clay

Coleman

Collin

Comal

Coryell

Crockett

Crosby

Culberson

Dallas

Deaf Smith

Edwards

Ellis

Erath

Falls

Gillespie

Gray

Hemphill

Hill

Hudspeth

Hutchinson

Irion

Jack

Jeff Davis

Johnson

Kerr

Kimble

Lamb

Lipscomb

Madison

Oldham

Palo Pinto

Parker

Pecos

Potter

Presidio

Randall

Red River

Reeves

San Saba

Stephens

Sutton

Tarrant

Taylor

Wheeler

Williamson