刺果藤 ci guo teng

Byttneria aspera Colebrooke ex Wallich (Mar-Jun 1824); B. siamensis Craib.

Woody, big lianas. Branchlets sparsely puberulent when young. Petiole 2-8 cm, hairy; leaf blade broadly ovate, cordate, or nearly orbicular, 7-23 × 5.5-16 cm, abaxially white stellate
puberulent, adaxially glabrous, basal veins 5, base cordate, margin entire, apex obtuse or acute. Sepals ovate, ca. 2 mm, puberulent, apex acute. Petals yellowish white, and purple-red adaxially, apex 2-lobed, with long ligulate appendix, nearly as long as sepals. Capsule globose or ovoid-globose, 3-4 cm in diam., spiny, spines short and robust, puberulent. Seeds oblong, ca. 12 mm, black when mature. Fl. spring and summer.

Open forests, valley streamsides; 200-300 m. Guangdong, Guangxi, Hainan, Yunnan [Bangladesh, Bhutan, Cambodia, India, Laos, Nepal, Thailand, Vietnam].