Annuals, green, 3-12+ cm, glabrous. Stems spreading to ascending or erect. Leaves alternate; blades 10-15 mm overall, lobed, lobes (3-)5-9, linear to filiform. Peduncles 1-5+ mm, glabrous. Calyculi 0, or of 1-2 subulate bractlets, lengths less than ¹/2 phyllaries. Involucres obconic to campanulate, 5-6.5 mm. Phyllaries 8-16, margins of outer distinct less than ¹/2 their lengths, abaxial faces glabrous. Ray florets 9-12; corollas white to pale yellow, laminae 3-4 × 1-3.5 mm. Disc florets ca. 25; corollas pale yellow, 3-4.5 mm. Cypselae 2.5-3 mm; pappi of 10-15 scales (each comprising 5-9 basally connate bristles) 1-2.5 mm. 2n = 16. Flowering spring, following rains. Sandy washes and flats, in deserts; 50-100 m; Ariz.; Mexico (Sonora).