Annuals 10-20 cm tall. Stems ascending to erect, with spreading branches, 4angled. Basal leaves withered at anthesis. Stem leaves widely spaced; leaf blade broadly ovate to cordate, 7-12 × 4-5 mm, usually shorter than internodes, base rounded, margin serrulate and ciliolate, apex acute, veins 3, prominent, and abaxially pubescent. Flowers terminal, solitary, sessile. Calyx tube tubular, 0.9-1.1 cm, membranous, narrowly and distinctly winged, ± minutely hispid along wings; lobes spreading, lanceolate to narrowly elliptic, 5-6 mm, base narrowed, apex acute, midvein decurrent outside into wings of calyx tube. Corolla pale purple, tubular, 3.5-4.5 cm; lobes ovate-elliptic, 8-10 mm, margin entire, apex subacuminate; plicae oblong, 3.5-4.5 mm, margin short laciniate. Stamens inserted at basal part of corolla tube, unequal; filaments 1.5-1.8 cm; anthers ellipsoid, 2-2.5 mm. Fl. and fr. Aug-Nov.

* Grassland slopes; 2400-3000 m. Guizhou, NE Yunnan.