Phytologia 27: 260. 1973.
Perennials; caudices thick, tough. Stems subscapiform, densely hairy proximally, sparsely hairy to subglabrous distally. Leaves mostly basal; petiole lengths ± equaling blades; blades ovate or elliptic, 20–30 (–40) cm, nearly as wide, deeply 3–4-pinnatisect, ultimate lobes narrowly triangular to oblong, acute; mid and distal leaves progressively smaller, bractlike. Calyculi: bractlets 2–4 mm. Phyllaries (4–) 5–7 mm. Corollas 7–9 mm. Cypselae 4–5 mm; pappi 4–7 mm. 2n = 60.
Phenology: Flowering summer–early fall.
Habitat: Shady sites, open woodlands
Elevation: 1700–2600 m
Ariz., N.Mex., Mexico (Chihuahua), Mexico (Durango), Mexico (Sonora)
Psacalium decompositum barely enters the flora area in Arizona and New Mexico.
"thick" is not a number."wide" is not a number.