Shrubs erect, unarmed. Stem and branches terete. Petiole 6--13 mm, widened toward base, abaxially striate-ridged, narrowly winged for ca. 2/3 its length; wings apically confluent to petiole; abscission zone apical; tendrils absent. Leaf blade abaxially glaucous, 2--7 × 1--4 cm, elliptic-oblong to ovate. Inflorescence of 1 umbel, basally not prophyllate; peduncle 1--3 cm; umbels of both sexes 3--5-flowered, base slightly thickened. Male flowers: tepals yellowish green, outer ones 2.5--3 × ca. 0.8 mm, inner ones ca. 2.5 × 0.5 mm; filaments connate, forming a column ca. 0.8 mm. Female flowers: tepals slightly smaller than male ones; staminodes 6. Berries black, globose, 5--7 mm in diam. Fl. Apr--May, fr. Oct.

* Forests, thickets, shaded places on slopes; 1600--2700 m. Sichuan, Yunnan.