Terrestrial herb, 10-30 cm tall. Stem thin, erect, pilose. Leaves subequal in a pair; petiole 1.5-4 cm long, pilose; blade papyraceous or chartaceous when dry, ovate to elliptic, 5-11 x 2.5-5 cm, margin serrulate to biserrulate, apex acute to obscurely acuminate, base round to slightly cordate and often unequal, above with scattered hairs, below with scattered hairs. Flowers in pseudoraceme-like cymose 3-15-flowered inflorescences; peduncle ca. 7 cm long, pilose; pedicel 1-1.5 cm long, pilose. Calyx green, reddish in bud, 4 lobes free, erect, equal, linear-lanceolate, 0.7-0.8 x 0.22 cm, the 5th one dorsal, recurved, margin entire, apex blunt, glandular, outside andinside pilose in upper half; corolla transversal-oblique in calyx, pale purple, 2-2.3 cm long, tube salverform, 1.5-1.8 cm long, base spurred, 0.25 cm wide, middle slightly curved, broadening towards throat, throat narrower dorsally, 0.85 cm wide, outside pilose, inside glabrous, limb 2.2-2.7 cm wide, lobes subequal, spreading, suborbicular, 0.7-0.8 x 0.7-0.8 cm, margin nearly entire; stamens included, adnate to tube in basal third; ovary conical, 0.2-0.22 x 0.1 cm (at base), pilose, style 0.4-0.43 cm long, glabrous, stigma capitate. Mature capsule brown, ovoid, 0.5-0.6 x 0.2-0.25 cm.
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