Smilax ferox Wall. ex Kunth

Vines climbing. Stem branched, terete, woody, usually sparsely prickly. Petiole 4--7(--13) mm, winged for 2/3 to nearly all its length; wings 1.5--2.5 mm wide; abscission zone distal; tendrils only occasionally developed on old stem or branches. Leaf blade abaxially often glaucous, oblong to oblong-lanceolate, 3.5--9(--12) × 1.5--3.5(--6) cm, papery to leathery. Inflorescence borne in axil of young leaf, of 1 umbel, basally not prophyllate; peduncle 1--1.6(--2.5) cm; umbels of both sexes 4--11-flowered, usually ± racemose due to elongate base, base thickened, 2--5 × 1--2 mm. Male flowers: tepals pale yellow, 3--4.5 × 1.5--2 mm; filaments 1.5--2 mm. Female flowers: tepals slightly smaller than male ones; staminodes 6. Berries red, globose, 8--10 mm in diam. Fl. Apr--May, fr. Oct--Dec. 2 n = 104.

Himalaya (Nepal to Assam).

Guangdong, Guangxi, Guizhou, Yunnan [Bhutan, India, Myanmar, Nepal, Vietnam].

1100-2700 m

Dense forests, thickets, shaded slopes; 1000--2900 m.

Kim cang gai hay cậm cang gai, kim cang hiên ngang, kim cang bao phấn to (danh pháp: Smilax ferox) là một loài thực vật có hoa trong họ Smilacaceae. Loài này được Wall. ex Kunth miêu tả khoa học đầu tiên năm 1850.

长托菝葜（学名：Smilax ferox）为百合科菝葜属下的一个种。