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Leaf blades 0.5–2.5(4.5) x 0.3–1.5(2) cm., elliptic to ovate, obtuse or subacute at the apex, rounded or cuneate at the base, glabrous save for the scabridulous to ciliate margins and appressed hairs on the midvein and some nerves; petiole 0.5–2 mm. long, glabrous or ciliate; stipule sheath 0.7–1(2) mm. long, produced into a 2-fid lobe 1–2 mm. long, ciliate.
Annual or possibly sometimes a short-lived perennial herb with prostrate, decumbent or ascending stems (7)10–40(90) cm. long, branched at the base, sometimes rooting at the nodes, glabrescent to sparsely hairy.
Inflorescences terminal, sessile, 9–25-flowered, subglobose, those on reduced side branches in lower axils appearing like axillary fascicles; pedicels 1–3 mm. long, glabrous to pilose.
Corolla white or less often pink or red, glabrous to pilose outside; tube 0.3 mm. long, sparsely pilose inside; lobes 0.8–1.2 x 0.7 mm., ovate-triangular.
Calyx tube c. 1 mm. long, subglobose, glabrous to spreading pubescent; lobes 1–1.5 x c. 0.5 mm., narrowly triangular, ciliate.
Capsule subglobose, 1.5 x 2 mm., glabrescent to pilose; beak slightly raised, puberulous.
Flowers not dimorphic, 4-merous or rarely 5–6-merous.
Prostrate herb with slender stems up to 18 in. long
Flowers white with mauve corolla-lobes, or pink
Bright green leaves drying yellowish
Seeds black, angular, 0.4 mm. long.