Rainbow Hills rabbitbrush

Chrysothamnus nauseosus (Pallas ex Pursh) Britton subsp. iridis L. C. Anderson, Great Basin Naturalist 41: 311. 1981; C. nauseosus var. iridis (L. C. Anderson) S. L. Welsh

Plants 10–20 cm. Stems grayish green (at least when young), leafy, faces ± compactly tomentose. Leaves grayish green; blades 1-nerved, linear, 15–40 × 0.8–1 mm, compactly tomentose. Involucres 12–16 mm. Phyllaries 20–26, apices erect, acute to acuminate, abaxial faces glabrous. Corollas 7.8–8.7 mm, tubes glabrous, lobes 1.5–2 mm, glabrous; style appendages longer than stigmatic portions. Cypselae glabrous; pappi 5.2–5.8 mm. 2n = 18.

Flowering late summer. Steep slopes on ± barren, gypsiferous, Arapien shale; of conservation concern; ca. 2000 m; Utah.

Variety iridis is known only from Sevier County.