Prodr. 1: 40. 1788 ,
Plants annual. Stems mostly erect, 1–3(–5) dm. Leaves alternate or opposite; blade elliptic to narrowly lanceolate, 4.5–8 × 1–3.5 mm. Pedicels erect in fruit, 2.5–4 mm, mostly equaling or shorter than subtending leaf. Flowers: sepals (4–)5, calyx divided nearly to base, 2–2.5 mm, equaling or longer than corolla, margins entire, narrowly or not scarious, apex acuminate; petals 5, corolla white, salverform (almost rotate), 1.5–2.3 mm. Capsules 1–1.5 mm. Seeds 5–12.
Phenology: Flowering spring–early winter.
Habitat: Ditch banks, other open sites
Elevation: 0-20 m
Fla., Mexico, West Indies (Jamaica), Central America, South America (Colombia, Ecuador).