Fl. N. Amer. 2: 431. 1843.
Dioecious. Plants 0.5–4 cm. Stolons none. Basal leaves: 1-nerved, linear to narrowly spatulate, 8–11 × 1–1.2 mm, tips acute, faces ± gray-tomentose. Cauline leaves linear or oblanceolate, 7–12 mm, not flagged (apices acute). Heads borne singly. Involucres: staminate 6–8 mm; pistillate 10–11 mm. Phyllaries distally dingy brown (apices acute-acuminate). Corollas: staminate 3–5 mm; pistillate 8–10 mm. Cypselae 2–3.5 mm, pubescent; pappi: staminate 4.5–6 mm; pistillate 10–12 mm. 2n = 28, 56.
Phenology: Flowering early–mid spring.
Habitat: Sagebrush steppe, plains, foothills of mountains
Elevation: 600–3400 m
Alta., B.C., Sask., Calif., Colo., Idaho, Mont., Nebr., Nev., N.Mex., Oreg., Utah, Wash., Wyo.
Antennaria dimorpha is characterized by narrowly oblanceolate leaves and relatively large heads (borne singly). It is, perhaps, the most xerophytic of spring-blooming Antennaria species. It belongs to the Dimorphae group.