Cat's claw is an evergreen woody vine. It can grow to up to 10 meter. Branchlets are quadrangular, brown, clean and hairless. Leaf axils have binate or solitary hook, which bents down, 1.7 to 2cm long, and with pointed tip. Leaves are opposite and petiolate. Leaf blade is ovate, ovate-oblong or elliptic, 5 to 12cm long, and 3 to 7cm wide. Inflorescence is solitary, axillary capitulum or apical raceme, in the diameter of 2 to 2.5cm. Peduncle is slender and 2 to 5cm long. Flowers are yellow and corolla is connate. Capsule is obovate or oval, sparsely pubescent, and with persistent calyx. And both ends of seeds are winged. Stems and leaves of Cat's Claw contain a variety of indole alkaloids, mainly include rhynchophylline, isorhynchophylline, corynoxeine, isocorynoxeine, corynantheine, dihydrocorynantheine, and more. And it still contains flavonoids compounds and catechin compounds.