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.

Flowering year-round (peak Mar-Aug). Sandy beaches; ca. 0 m; La., Tex.; Mexico (Tamaulipas, Veracruz).