Annuals, 12-30 cm . Stems glabrous. Leaves: basal sometimes persistent, proximal usually absent at flowering; cauline blades 1-nerved, narrowly elliptic-oblanceolate to elliptic-lanceolate, 1-2 mm wide, reduced distally. Heads borne singly or in loose, open arrays. Involucres campanulate, 4-7 mm diam. Phyllary apices flat. Ray florets 8-15; corollas white, drying light yellow or reddish, 6-7.5 mm. Disc florets (16-)20-30(-40). Cypselae 0.9-1.6 mm, faces without oil cavities, densely strigoso-sericeous (hair apices prominently bulbous-capitate); pappi coroniform or of 1 series of basally connate scales 0.1-0.3 mm (obscured by cypsela indument). 2n = 8. Flowering (Feb-)Mar-May. Sandy or sandy-rocky plains or washes; 200-1300 m; Ariz.; Mexico (Sonora).