Annual herbs, up to 80 cm. Stems branched, often with decumbent branches, glabrous or glabrescent to slightly scabrous but sometimes glandular pubescent. Stipules ca. 0.5 mm, scalelike or absent. Leaves 3-foliolate, leaflets 3; leaflet blades oblanceolate to rhomboid-elliptic, 1-3.5 × 0.5-1.7 cm, abaxially with curved trichomes on veins especially when young, adaxially glabrous, margins entire or serrulate-ciliate, apex acute, obtuse, or sometimes acuminate. Inflorescences terminal and axillary, 2-4 cm but 8-15 cm in fruit, 3-6-flowered; bracts leaflike, Petals white or speckled with purple, oblong to narrowly ovate, central 2 petals outside with a yellow transverse band. Filaments yellow, 5-7 mm; anthers purplish brown, 1-2 mm. Pistil 2-3 mm, glabrous; style 0.5-1.4 mm. Fruit with a 4-12 mm gynophore; capsule striate. Seeds 4-25 per capsule, reddish brown to black with white funicular aril.