Smooth-fruit rabbitbrush

Bigelowia leiosperma A. Gray in A. Gray et al., Syn. Fl. N. Amer. 1(2): 139. 1884 (as Bigelovia); Chrysothamnus nauseosus (Pallas ex Pursh) Britton subsp. leiospermus (A. Gray) H. M. Hall & Clements

Plants 25–60 cm. Stems yellowish green, often leafless at flowering, densely, compactly tomentose. Leaves yellowish green; blades 1-nerved, filiform, 10–30 × 0.8–1 mm, faces glabrate . Involucres 8–11.5 mm. Phyllaries 17–31, apices erect, acute to obtuse, abaxial faces glabrous. Corollas 5–8.5 mm, tubes mostly glabrous, lobes 0.5–1.1 mm (erect to incurved), glabrous; style appendages longer than stigmatic portions. Cypselae glabrous; pappi 3–6.6 mm. 2n = 18.

Flowering late summer–fall. Gravelly and sandy soils, rocky crevices; 700–2800 m; Ariz., Calif., Colo., Nev., Utah.