Shrubs suberect to subscandent, unarmed. Stem branched, terete, 50--100 cm, smooth. Petiole slender, 3--7 mm, narrowly winged for 1/3--1/2 its length; abscission zone apical; tendrils sometimes present. Leaf blade usually turning blackish when dried, abaxially glaucous, ovate-elliptic to elliptic, 2--5 × 1--2.5 cm. Inflorescence of 1(or 2) umbels, basally not prophyllate; peduncle slender, 3--7 mm; umbel 1--3-flowered, base not thickened; bracteoles small, usually caducous. Male flowers: tepals 2--2.5 × 0.8--1.3 mm; stamens 1--1.5 mm. Female flowers unknown. Berries purplish black, globose, 5--7 mm in diam. Fl. Jun, fr. Nov.

This species is quite different from Smilax microphylla C. H. Wright in having elliptic leaves that are blackish when dried and a scarcely swollen peduncle apex.

* Forested slopes; 1100--2200 m. Guizhou, Sichuan, Yunnan.