Stems up to 50 cm, slender, glabrous, longitudinally 3-winged, branches extremely short, with several leaves appearing in a fascicle. Petiole 2-9 mm; leaf blade paler green abaxially, deltoid, orbicular, or ovate, 7-12 × 7-12 mm, glabrous or appressed hispidulous, base truncate or rounded, sometimes cordate, margin serrate, teeth mucronate, blade apex acute. Flowers sessile, ca. 5 mm, single or 2 inserted at apex of short lateral branches. Hypanthium campanulate, 1-2 mm; calyx lobes narrowly triangular or subulate, 1-2 mm, with a pair of teeth. Corolla white, pale blue, or pale purple, 3-4 mm; lobes cleft to slightly over half its length, linear or oblong. Filaments ca. 1 mm; anthers elongate or lanceolate; style ciliate, exserted or equal to length of corolla. Fruit ovoid to globose, ca. 2.5 mm, pericarp thin. Seeds several, brown, ellipsoid, ca. 0.7 mm. Fl. and fr. Apr-Aug.
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