Annuals. Stems erect, (sometimes suffrutescent, much-branched), to 10 dm. Cauline leaves: blade broadly ovate or spatulate, margins sinuate, dentate, or pinnately lobed. Racemes: 1–2 dm; rachis geniculate. Fruiting pedicels (rachis of equal width), 2–5 mm, (widely spaced). Flowers: sepals 3–4 mm, lateral pair not saccate basally; petals white to pale lavender, 4–6.1 × 1.2–1.9 mm, claw distinct. Fruits (8-ribbed), lanceoloid, 20–27 × 3–5 mm; proximal segment terete, (6–11 mm); terminal segment slenderly conical, (13–18 mm), apex acute to blunt, (often slightly curved). Seeds: cotyledons accumbent to obliquely incumbent. 2n = 18.
Phenology: Flowering year-round (peak Mar–Aug).
Habitat: Sandy beaches
Elevation: ca. 0 m
La., Tex., Mexico (Tamaulipas, Veracruz).