Polytaenia nuttallii Dc.

Plants 5–10 dm, puberulent above; lower lvs long-petioled, ovate, the ultimate segments narrowly ovate to linear-oblong, each usually with a few sharp teeth; rays 10–20, scaberulous on the upper side; pedicels 3–5 mm, fr elliptic or oblong, 6–8 mm, depressed in the center over the dorsal ribs; 2n=22. Prairies and plains; Mich. and Wis. to Neb., s. to Miss., Tex., and N.M. May, June. (Pleiotaenia n.)