Sida 21: 2016. 2005.
Annuals, usually narrowly taprooted. Stems usually 1, erect to decumbent-ascending. Leaves: basal and proximal cauline 15–40(–50) × 3–11(–14) mm. Involucres (2–)2.5–4.5 mm. Ray florets (7–)13–24; corolla laminae white, occasionally drying with bluish midstripe abaxially, (4–)6–10(–12) mm. Disc floret corollas 2–3 mm. Cypselae 1–1.6 × 0.6–0.8 mm, faces minutely longitudinally striate, otherwise nearly smooth, rarely papillate-pebbly, uniformly sparsely to densely glochidiate-hairy. 2n = 8.
Phenology: Flowering Mar–May.
Habitat: Open sandy sites, less commonly in loam or clay, oak and oak-hickory woodlands, roadsides, pastures, grassland, also occasionally (Ark., Okla.) on rocky ridges, limestone outcrops, gravelly stream bottoms
Elevation: 10–100 m
Ark., Kans., Mo., Okla., Tex., Mexico (Nuevo León, Tamaulipas).