Scrambling or decumbent herb with ascending branchlets, much branched, 0.3–0.6 m. long; stems often dark crimson, square, sparsely to densely hairy on the angles. Leaf-blades elliptic to ovate, 1.2–6.5 cm. long, 0.35–3 cm. wide, acute at the apex, cuneate at the base, glabrous to pubescent above, with sparse hairs to pubescent beneath and always scabrid on the margins; venation impressed, giving a bullate and plicate appearance to the blade; petiole 0–1 mm. long; stipule-base 4–6 mm. long, hairy, at least above, with 5–9 fimbriae 7–8.5 mm. long. Flowers in dense few–many-flowered axillary clusters at most nodes; fimbriae of stipuliform bracts 6 mm. long, ciliate. Calyx-tube fusiform or obconic, 1.2–3 mm. long; lobes foliaceous, lanceolate to linear-lanceolate, 3.5–5(–9) mm. long, 0.8–1 mm. wide, with pubescent margins. Corolla white; tube cylindrical or narrowly funnel-shaped, 6.5–10.5 mm. long, 0.4–2.5 mm. wide; lobes oblong or elliptic, 3–4 mm. long, 0.8–2.5 mm. wide. Filaments exserted 1–1.5 mm. Style exserted 2.5–4 mm.; stigma-lobes 0.5–1 mm. long. Capsule oblong-ellipsoid, 5–6 mm. long, 2 mm. wide, the valves opening widely, finely transversely wrinkled, glabrous or finely pubescent, crowned with the persistent calyx-lobes. Seeds dark purple-brown, fusiform, 4 mm. long, 1.6 mm. wide, 0.7–0.8 mm. thick, deeply grooved ventrally, narrowed at one end, shiny, finely rugulose and sometimes with a shallow dorsal groove as well.
