Description from Flora of China
Pentapterygium flavum J. D. Hooker, Bot. Mag. 82: t. 4910. 1856.
Shrubs. Twigs terete, glabrous or pubescent towards apices. Leaves scattered; petiole 3–4 mm; leaf blade ovate or elliptic, 5–9 × ca. 3.4 cm, leathery, abaxially silky-hairy on midvein, adaxially rugose with fine veins, glabrous, base rounded, margin serrate, apex acute. Inflorescences corymbose, pendulous or nodding. Pedicel red, ca. 2 cm, pubescent, expanded upwards. Calyx tube yellowish, rounded, 5-winged; lobes triangular-ovate, ca. 8 mm, striate, pubescent. Corolla yellow, tubular, ca. 1.7 cm, inflated at middle, angled, puberulous; lobes recurved, small. Filaments pubescent; anthers with tubules ca. 3.5 × as long as thecae, with 2 spurs. Berry ca. 8 mm in diam.
The above description follows that in the protologue.
Forests, epiphytic on trees; 1200–1500 m. SE Xizang [NE India].