EcoFlora - Xanthisma spinulosum var. chihuahuanum

Xanthisma spinulosum var. chihuahuanum (B.L. Turner & R.L. Hartman) D.R. Morgan & R.L. Hartman
Family: Asteraceae Chihuahua tansyaster [Haplopappus spinulosus var. chihuahuanus (B.L. Turner & Hartman) Gandhi, more]	FNA Resources Ronald L. Hartman in Flora of North America (vol. 20) Perennials, 30-50 cm, often woody at base. Stems stiffly erect, usually much branched in proximal ¹/ 2 -²/ 3 ; mid internodes 2-5 mm. Leaves numerous, concentrated in proximal ± ¹/ 2 , spreading to loosely ascending, often much reduced distally, margins of proximal pinnatifid to 2-pinnatifid, of distal coarsely dentate to ± entire, lobes linear to lanceolate, 3-5 mm, faces usually hairy, rarely glabrous, often densely stipitate-glandular. Heads 2-10+ in diffuse arrays. Peduncles relatively terminal and lateral, 0.5-2 cm. Involucres 12-15 mm wide. 2n = 8, 16. Flowering spring-fall. Clayey to rocky washes, prairies, plains, roadsides; 1000-1800 m; Ariz., N.Mex., Tex.; Mexico (Chihuahua, Coahuila, Durango, Sonora). Variety chihuahuanum is a Chihuahuan Desert taxon that extends into the southern United States.
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