Haplopappus spinulosus (Pursh) DC.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Several-stemmed perennial 2–6 dm, thinly tomentose at least when young, sometimes later subglabrate; lvs 1.5–6 cm × 2–10 mm, pinnatifid, with narrow lobes and narrow rachis less than 3 mm wide; achenes hairy, the nerves obscure; pappus persistent; 2n=16 + 2 B. Dry plains and foothills; Minn. to Alta. and Mex. July–Sept. Our plants are var. spinulosus. (Sideranthus s.)