Annuals, (5-)10-30(-60+) cm. Leaves: petioles 3-20 mm; blades usually rounded-deltate overall, 10-30+ × 5-20+ mm, 1-2-pinnatisect, ultimate lobes linear to filiform, 2-25 × 0.5-1(-2) mm, bases obscurely cuneate, ultimate margins minutely, if at all, ciliate, apices obtuse to acute (sometimes apiculate), faces glabrous or sparsely hirtellous. Heads usually borne singly. Peduncles 10-50(-100) mm. Calyculi of (1-)3(-5), appressed to spreading, linear bractlets (1-)3(-4) mm, margins minutely, if at all, ciliate, abaxial faces usually glabrous, sometimes sparsely hispidulous. Involucres ± cylindric, 3.5-5 × (1-)2-3 mm. Phyllaries 5-6, lance-elliptic to lanceolate, 2.5-4(-5) mm. Ray florets 0 or 1-3+; laminae yellowish, 1-4 mm. Disc florets 5-9(-13); corollas yellowish, 1-1.5 mm. Cypselae red-brown to blackish (sometimes with lighter blotches), outer ± obcompressed and linear, 3-5 mm, margins not ciliate, apices ± truncate, faces 2-grooved, usually glabrous; inner similar, ± equally 4-angled, linear-fusiform, (6-)7-12 mm, apices ± attenuate; pappi 0, or of 2(-3) spreading to divergent, retrorsely barbed awns 1-2 mm. Flowering Sep-Oct. Seeps on rocky slopes; 1500-2800 m; Ariz., Colo., N.Mex.; Mexico (Baja California, Chihuahua, Sinaloa, Sonora).