Description from Flora of China
Shrubs erect, creeping or forming an intricate cushion, deciduous, 0.3-5 m. Branchlets 4-angled, somewhat narrowly winged, glabrous. Leaves opposite, 3-foliolate or often simple at base of branchlets; petiole 3-10 mm, glabrous; leaf blade ovate or elliptic, sometimes suborbicular, 0.7-2.2 cm × 4-13 mm; leaflet blade ovate to elliptic, rarely obovate, base cuneate, apex acute or obtuse, mucronulate, veins obscure, terminal one sessile or basally decurrent into a short petiolule, 1-3 × 0.3-1.1 cm, lateral ones sessile, 0.6-2.3 cm × 2-11 mm. Flowers solitary, axillary or rarely terminal; bracts ovate to lanceolate, leafy, 3-8 mm. Pedicel 2-3 mm. Calyx green; lobes 5 or 6, narrowly lanceolate, somewhat leafy, 4-6 mm. Corolla yellow, 2-2.5 cm in diam.; tube 0.8-2 cm; lobes 5 or 6, oblong or elliptic, 0.8-1.3 cm. Berry ovoid or ellipsoid, ca. 6 × 3-4 mm.
* Thickets, ravines, slopes; 800-4500 m. Gansu, Shaanxi, Sichuan, SE Xizang, NW Yunnan