Perennial herb with (5–)20–100 decumbent to suberect stems from a woody usually multi-headed rootstock; stems 4–20 cm. long or tall, strongly 4-ribbed, glabrous or with traces of minute emergences.. Leaf-blades narrowly to broadly elliptic or oblong-elliptic, 0.6–2.1 cm. long, 1–8 mm. wide, rounded or obscurely acute at the apex, narrowed into the stipule-sheath or very short petiole at the base, entirely glabrous save for some minute hairs on the margins; petiole ± obsolete or apparently up to 1 mm. long; stipule-base 1–2 mm. long, bearing 3–5 fimbriae 0.5–2 mm. long.. Flowers in small terminal and axillary clusters at the upper nodes, (3–)4–5 mm. in diameter.. Calyx-tube obconic, 1 mm. long; lobes 4, sometimes with additional narrow ones (or abnormally ± 10), oblong, 0.8–0.9 mm. long.. Corolla white; tube 0.5 mm. long; lobes oblong-triangular, 1 mm. long, 0.8 mm. wide.. Anthers just protruding beyond the sinuses.. Stigma minute, together with the style 0.4 mm. long.. Capsule oblong in outline, 2 mm. long, 1.9 mm. wide, 1.2 mm. thick.. Seed 1/2-ellipsoid, 1.8 mm. long, 1 mm. wide, 0.4–0.5 mm. thick.
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