Annuals 20-40 cm tall. Stems erect, slender, angled, papillate along angles; branches few, short. Basal leaves withered at anthesis. Stem leaves widely spaced; leaf blade broadly ovate to cordate, 5-10 × 4-8 mm, shorter than internodes, abaxially papillate on veins, base subcordate, margin serrulate, apex acute; veins 3-5, abaxially distinct. Flowers terminal, solitary, sessile. Calyx tubular, 8-10 mm; tube membranous, angled, minutely hispid along angles; lobes narrowly ovate to triangular, 1.5-2 mm, apex acuminate, midvein prominent outside and decurrent into angles of calyx tube. Corolla purple, salverform, 1.5-2 cm; tube 3-3.5 mm wide but with an abruptly expanded limb 8-10 mm wide; lobes lanceolate, 6-8 mm, margin entire, apex acute; plicae lanceolate, 4-6 mm, margin denticulate. Stamens inserted at basal part of corolla tube, unequal; filaments 8-10 mm; anthers narrowly ellipsoid, 1.5-2 mm. Ovary ellipsoid, 5-7 mm; gynophore ca. 3 mm. Style 4-6 mm; stigma lobes linear. Fl. and fr. Jul-Nov.

* Grassland and gravel slopes, forest margins; 1100-2100 m. C and NW Yunnan.