Sida 8: 313. 1980.
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.
Phenology: Flowering (Feb–)Mar–May.
Habitat: Sandy or sandy-rocky plains or washes
Elevation: 200–1300 m
Ariz., Mexico (Sonora)
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