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Prostrate perennial herb. Leaves paired, small, shortly petiolate; stipules in lower part of stem with sheath produced into an undivided triangular lobe, in the upper part deeply bifid into narrowly triangular fimbriae or less often with 3 fimbriae. Flowers white, small, hermaphrodite, dimorphic, in terminal triads or sometimes solitary. Calyx-tube ovoid or ellipsoid; lobes 4, equal, oblong-elliptic or oblong-spathulate, rather thick, exceeding the tube, joined at the base to form a free tube. Corolla-tube shortly cylindrical or narrowly funnel-shaped, sparsely pilose inside; lobes 4, elliptic-oblong to oblong-lanceolate. Stamens completely exserted in short-styled forms. Ovary 2-locular, with peltate placentas and 8 to fairly numerous ovules; style stoutly filiform, minutely bifid at apex, the stigma-lobes short, subglobose or ellipsoid. Fruit capsular with bony walls, ellipsoid, produced into a solid beak, at length apically loculicidally dehiscent. Seeds few per locule, blackish, angular, pitted.