A perennial, creeping herb, forming dense to lax mats. Stems up to 35(46) cm. long, prostrate or ascending, rooting at the lower nodes (roots very slender), simple or often the ± long prostrate part emitting short to ± long erect or ascending branches, these also rooting, mostly herbaceous-succulent (nearly translucent on drying), 4-gonous, glabrous except for two longitudinal lines of papillose hairs along two opposite sides, pale green; lower and median internodes up to 7·5 cm. long, rather longer than the leaves, the others successively shortening upwards (the uppermost shorter than the leaves). Leaves 0·5-2·8 cm. long (with the petiole) and 0·4-1·5 cm. broad, ovate-cuneate, triangular-ovate to elliptic or rhombic, rarely suborbicular, shortly acuminate, acute and sometimes apiculate at the apex, rarely (the suborbicular ones) obtuse, entire, sometimes minutely papillose-Sérrulate at the margin, cuneate or ± long attenuate into the petiole, glabrous, pale green (paler below), flat, succulent, usually thinly membranous on drying, sometimes longitudinally parallel-lineolate (the lines short, slender, brownish) and with a submarginal row of pellucid small dots; petiole ± 0·4 to ± 1·3 cm. long (delimitation from the lamina usually difficult), glabrous, dilatate below and connate with the opposite one in a sheath, provided with axillary fascicles of minute leaves or with short branchlets; sheath 0·5-1·5 mm. high, papillose-hairy at the margin. Flowers 5(6)-merous, usually solitary in the axils towards the extremities of the stem and branches, one for each node and alternating at the contiguous nodes, sometimes also in contracted terminal few-flowered inflorescences ± concealed by the upper leaves; pedicels 3-21 mm. long (the lowest ones the longest), filiform, ampliate-obconical below the calyx, usually glabrous. Calyx (2·75)4·5-5·5 mm. long, glabrous, green, usually more than half as long as but not exceeding the corolla; sepals (2·5)3·5-5 x 0·75-1(1·5) mm., lanceolate or oblong-lanceolate, attenuate towards the rather acute apex, connate at base for c. 0-5 mm., flat, with whitish-hyaline margins, sometimes brownish-lineolate along the median part. Petals (3)5-6 x 1·25-1·75 mm., oblong-lanceolate, acute, not mucronate, smooth on both faces, nearly free, usually white, rarely tinged with pink towards the apex outside. Filaments ± 3 mm. long; anthers c. 4 mm. long. Follicles (3)4-5·5 mm. long (with the styles), oblong, contracted into the styles, ± equalling the corolla-length, minutely pitted; styles ± 0·5 mm. to ± 0·75 mm. long. Seeds c. 0·5 mm. long, oblong, brownish, minutely tuberculate.
