Senecio douglasii de Candolle var. jamesii (Torrey & A. Gray) Ediger ex Correll & M. C. Johnston; S. douglasii var. longilobus (Bentham) L. D. Benson; S. longilobus Bentham

Herbage usually tomentose (hairs whitish), sometimes unevenly glabrescent. Calyculi: bractlets minute or 0. Involucres cylindric or weakly campanulate. Phyllaries ± 13 (± 21), 5– 8+ mm.

Flowering mostly summer–fall, less frequently spring. Dry, open sandy or rocky plains, streambeds, and canyons; 800–2400 m; Ariz., Colo., Kans., N.Mex., Okla., Tex., Utah; Mexico.

Senecio flaccidus var. flaccidus intergrades at least to some extent with var. monoensis in areas of overlapping ranges; a case could be made for treating the two as distinct species, as done by A. Cronquist (1994).