Annuals, 10–25 (–50) cm. Leaves: petioles 5–40 mm (usually hispido-ciliate); blades rounded-deltate overall, 15–50+ × 12–40+ mm, 1–2-pinnatisect, ultimate lobes ovate or lanceolate to linear, 3–25+ × (1–) 2–3 (–15) mm, bases ± cuneate, ultimate margins entire, ciliolate, apices acute to attenuate, faces glabrous or hirtellous. Heads usually borne singly, sometimes in open, ± corymbiform arrays. Peduncles (10–) 30–80+ mm. Calyculi of 3–4 (–6) ± appressed, subulate to filiform bractlets 1–3 mm, margins ciliolate, abaxial faces usually glabrous. Involucres ± cylindric, 2–3 (–4+) × 1.5–2+ mm. Phyllaries 4–5 (–7), oblong to lanceolate, (2–) 3–4+ mm. Ray-florets 0 or 2–3; laminae yellowish or whitish, 1–3 mm. Disc-florets 5–13; corollas yellowish to whitish, 1.5–2 mm. Cypselae: outer redbrown, flat or unequally 4-angled, linear, 6–8 mm, margins not ciliate, apices somewhat attenuate, faces obscurely 2-grooved, antrorsely hispidulous toward tips; inner similar, blackish (sometimes with pale tips), ± equally 4-angled, linear-fusiform, 9–14 mm, margins not ciliate, apices attenuate, faces 2-grooved, antrorsely hispidulous (at least distally); pappi of 2 (–3), erect, retrorsely barbed awns 1–3 mm.
Phenology: Flowering Sep.
Habitat: Along streams
Elevation: 900–1800 m
Distribution
Ariz., N.Mex., Tex., Mexico (Baja California), Mexico (Chihuahua)
Discussion
Selected References
None.