Adenophyllum cooperi

Perennials or subshrubs, 30-50+ cm. Leaves mostly not lobed, blades oblanceolate to ovate, 8-25 × 4-8 mm (bases sometimes toothed or obscurely lobed, oil-glands 1-2 pairs near base, 1 near tip, each leaf). Peduncles 60-150 mm. Calyculi of 12-22 linear-attenuate, gland-bearing, bractlets 5-8 mm. Involucres campanulate to obconic, 15-18 mm. Phyllaries ca. 20, lanceolate to linear, separating in fruit. Ray florets (0-)7-13; corollas yellow-orange, becoming red-orange; tubes 5 mm, laminae 8-10 × 2.5-4 mm. Disc florets 50-80+; corollas yellow, 8-10 mm. Cypselae 5-7 mm; pappi of 15-20 scales 7-10 mm, each comprising 5-9, basally connate bristles. 2n = 26.

Flowering spring-fall. Sandy and gravelly soils of washes and alluvial fans in deserts; 0-1300 m; Ariz., Calif., Nev.