Perennial herb, in the basal part creeping and rooting at the nodes. Stem terete to faintly quadrangular, at the top with two narrow wings most distinct below the nodes; glabrous. Leaves glabrous, with narrowly triangular, 1.5 mm long, acute, soon shrivelling interpetiolar stipules, (elliptic-)oblong, 6-14 by 3-6 cm, thin-papyraceous, base cuneate and decurrent, apex tapering acute-acuminate; nerves c. 8 pairs; petiole flat above, 1-1.5 cm. Inflorescences terminal and axillary, glabrous, rather dense, 2-3 cm long, 7-8 cm peduncled, ultimate branches short. Bracts narrowly deltoid, up to 1.5 mm. Pedicels slender, 1-1.5 mm. Calyx obconical, 1-1.25 mm long, sepals oblong-ovate, acute, with broad membranous margins, glabrous. Corolla 2 mm long, white, lobes c. 2/3 mm, elliptic, rounded, papillose inside. Stamens inserted about halfway the corolla-tube, glabrous, filaments 1/4-1/3 mm, anthers elliptic-ovate, 0.5 mm long. Pistil glabrous, stigmas subsessile, connate. Fruits broad-ovoid, bilobed, not or only very slightly split at the apex, c. 3 mm ø. Seeds about hemispherical to tetraedrical, c. 0.75 mm, minutely warty.
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