Description from Flora of China
Stems yellow or yellowish green, stout, 2-3 mm in diam., with brown spots. Inflorescences lateral, few to many flowered, in racemes or panicles 1.5-3 cm, branched; bracts and bractoles scalelike. Pedicel 2-4 mm, together with peduncle, brown spotted or tuberculate. Calyx cupular; sepals 5, broadly ovate, equal, 2-2.5 mm, with a few tubercles abaxially, apex rotund. Corolla white or creamy, fragrant, tubular, 5-9 mm; lobes early deciduous, often reflexed, sometimes erect, triangular-ovate, shorter than tube. Stamens inserted at throat; filaments shorter than anthers or absent; anthers elliptic-ovate; scales oblong, reaching middle of tube, short and densely fimbriate. Ovary ovate-conical. Style 1, very short or absent; stigma divergent or erect, elongated, ligulate, longer than style. Capsule conical-globose, subquadrate when mature, 5-10 mm in diam., circumscissile. Seeds 1-4, dark brown, oblong, ca. 4 mm. 2n = 28, 32, 36, 42.
On shrubs; 900-2800 m. Hunan, Sichuan, Xizang, Yunnan [Afghanistan, India, Indonesia, Malaysia, Myanmar, Nepal, Pakistan, Sikkim, Sri Lanka, Thailand]