Description from Flora of China
Codonopsis inflata J. D. Hooker & Thomson, Ill. Himal. Pl. t. 16, C. 1855.
Plants voluble. Roots slightly thickened, branched. Stems almost glabrous. Leaves alternate; petiole 3-6 cm; blade ovate to ovate-lanceolate, 4-10 × 2-5 cm, abaxially glaucous, puberulent, adaxially glabrous or sparsely puberulent, base deeply cordate, margin entire or sinuate, apex acuminate. Flowers almost opposite to leaves, or in terminal and few-flowered cymes; pedicels 2-3 cm. Calyx adnate up to top of ovary; tube obdeltoid-conical, puberulent; lobes and corolla inserted at same position, ovate-triangular, ca. 1 cm, margin often recurved. Corolla pale yellow or pale green, but often purple at margin and veins, campanulate, 2.5-3 cm, cleft to 1/3. Filaments glabrous. Style glabrous; stigma 3-lobed; ovary 3-locular. Berry ?yellow-green, globose, 12-15 mm in diam. Seeds ovoid-globose, surface reticulate. Fl. and fr. Aug-Sep.
Broad-leaved forests, herb communities at forest margins; below 2500 m. SE Xizang (Mêdog) [Bhutan, NE India, E Nepal].