Xanthisma spinulosum var. spinulosum
Perennials, 10–40 cm, rarely woody at base. Stems spreading to sprawling, rarely stiffly erect, usually much branched in proximal 1/2–2/3; mid internodes 2–5 mm. Leaves numerous, equally spaced, mostly spreading to loosely ascending, not much reduced distally, margins pinnatifid or 2-pinnatifid, lobes linear to lanceolate, mostly 2–5 mm, faces usually hairy, rarely glabrous, usually stipitate-glandular. Heads 2–10+ in diffuse arrays. Peduncles relatively terminal and lateral, 0.5–2 cm. Involucres 8–12 mm wide. 2n = 8, 16.
Phenology: Flowering spring–fall.
Habitat: Rocky to sandy plains and rolling hills, washes, roadsides
Elevation: 300–1300 m
Alta., Man., Sask., Ariz., Colo., Idaho, Iowa, Kans., Minn., Mont., Nebr., N.Mex., N.Dak., Okla., Utah, Wyo., Mexico (Coahuila), Mexico (Nuevo León), Mexico (San Luis Potosí), Mexico (Tamaulipas), Mexico (Zacatecas)
"spreading" is not a number.