This common weed of pastures and roadsides occurs mostly from Texas to the lower Mississippi Valley (Y), and it has recently been confirmed from the Coastal Plain in w. Ky. (M. Brock, pers. comm.). In additon to several colls. at APSC, there are reported colls. from CARL (R. Athey #694 at MEM), CHRI (Johnston 1958) and GRAV (C. Deam #600061 at IND). C. lindheimeri has been combined with capitatus as a variety by some authors. It differs as follows (Y): leaf blades with apex sharply pointed (versus rounded to sharply pointed) and tapered from near base (versus 1/2 to 1/3 above base); lower leaves relatively long-petiolate, the petioles progressively shorter above mid-stem (versus all leaves long-petiolate); seeds oblong (versus suborbicular), the surface finely but faintly roughened and usually mottled (versus smooth, not mottled). Hairs are usually yellowish to pale brown on the inflorescence and upper stem (versus consistently white in capitatus).