Smithsonian Contr. Knowl. 5(6): 86. 1853.
Perennials, 30–50 (–80) cm. Aerial stems (from ± erect caudices) 1–10+, stramineous to reddish, glabrous or sparingly hairy. Leaf-blades deltate-lanceolate, (1.5–) 3–6 × 0.8–3 cm, margins irregularly dentate to subentire (proximal teeth larger), apices acuminate to obtuse, faces sparsely pubescent to glabrescent. Heads 1–10+. Peduncles (6–) 15–30 cm. Involucres 12–20 mm diam. Phyllaries densely pubescent on margins and apices, abaxial faces glabrescent. Paleae lanceolate to oblong, apices acuminate, faces glabrous. Ray-florets 9–11; corollas golden yellow (young) to pale-yellow (old), laminae (1–) 2–3 cm × 5–14 mm. Disc-florets 8–50+; corollas greenish yellow to yellowbrown (lobes brighter than tubes), 3–4.5 mm, glabrous. Cypselae 4.5–5 mm, glabrous, rugulose to subtuberculate; pappi 0.2n = 28.
Phenology: Flowering late spring–early fall.
Habitat: Open, rocky mountain slopes, canyons
Elevation: 1200–2500 m
Ariz., N.Mex., Tex., Mexico (Chihuahua), Mexico (Coahuila), Mexico (Durango), Mexico (Sonora), Mexico (Tamaulipas)
"broader" is not a number.