Description from Flora of China
Codonopsis subg. Leptocodon J. D. Hooker & Thomson, Ill. Himal. Pl. t. 16, A. 1855.
Vines, perennial. Stems slender. Leaves alternate, but on branches often opposite or subopposite. Flowers solitary, outside axils, less frequently in axils, or opposite to leaves. Calyx 5-lobed, tube broadly obconical. Corolla tubular, 5-lobed. Stamens 5; filaments long, base slightly dilated, alternate with 5 free, lamellar glands. Ovary semi-inferior, with superior part narrowly conical, 3-locular; style long; stigma 3-fid, segments clavate. Capsule 3-loculicidal at superior part. Seeds numerous.
Two species: Bhutan, SW China, N India, N Myanmar, E Nepal; two species (one endemic) in China.
(Authors: Hong Deyuan (洪德元); Thomas G. Lammers, Laura L. Klein)