Annuals 2-7 cm tall. Stems erect, subquadrangular. Basal leaves withered at anthesis. Lower stem leaf petioles slender, to 3 cm; leaf blade spatulate to obovate, 3-6 × 2-3.5 mm, base cuneate, margin usually purple, apex rounded, reticulate veins slender. Middle to upper stem leaves sessile, oblong to ovate-orbicular, 3-9 × to 5 mm, base and apex subrounded, reticulate veins slender. Flowers terminal, solitary. Calyx lobes 2, foliose, broadly oblong to ovate-orbicular, 5-10 × 4-6 mm, margin purple, apex rounded, reticulate veins purple. Corolla pale blue, 5merous, tubular, 7-12 mm; lobes broadly oblong to obovate-oblong, 2-3 mm, scale 1, apex rounded. Nectaries 10, brown. Stamens inserted at middle of corolla tube; filaments ca. 2 mm; anthers blue, ellipsoid, 0.5-0.7 mm. Ovary ellipsoid, 5-6.5 mm. Style indistinct; stigma lobes suborbicular. Fl. Sep.
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