Description from Flora of China
Nauclea scandens Smith in Rees, Cycl. 24: Nauclea no. 9. 1813; Cephalanthus cavaleriei H. Léveillé; Uncaria wangii F. C. How.
Large lianas, height not noted. Young stems slender, weakly to markedly quadrangular, densely hirtellous or pilosulous. Petiole 3-6 mm, hirtellous to pilosulous; leaf blade drying papery, ovate, ovate-oblong, lanceolate, elliptic, or elliptic-oblong, 10-15 × 3-5.5 cm, adaxially sparsely to moderately strigillose or scabrous-puberulent on lamina and densely puberulent to strigillose on veins, abaxially moderately to densely pilosulous, hirtellous, and/or strigillose usually with at least some pubescence spreading, base rounded to truncate, subcordate, or cordulate, apex acute or usually acuminate; secondary veins 7-10 pairs, usually with pilosulous domatia; stipules deciduous, ovate, 6-10 mm, deeply 2-lobed, strigillose, puberulent, or glabrescent, lobes lanceolate, ovate, or narrowly triangular, acute. Inflorescences axillary and often in terminal groups of 5-7 heads, densely pilosulous to tomentulose; peduncles 3-7 cm, simple; bracts 4-9 mm; flowering heads 9-12 mm in diam. across calyces, 25-30 mm in diam. across corollas; bracteoles linear or linear-spatulate, 1-3 mm, sparsely pubescent. Flowers sessile. Calyx with hypanthium portion obconic, 1-1.5 mm, densely strigose or pilose; limb 2-3 mm, lobed for up to 2/3, densely grayish white strigillose; lobes linear or linear-spatulate, 1.5-2 mm, obtuse. Corolla pale yellow sometimes flushed with pink, salverform, outside sparsely to densely hirtellous; tube 8-10 mm; lobes obovate to elliptic, ca. 2 mm, rounded. Fruiting head 20-25 mm in diam. Fruit sessile, obovoid to oblanceoloid, 6-9 mm, hirtellous; seeds orange-yellow, ca. 2 mm. Fl. Feb, Apr, fr. Jul, Nov.
This species was illustrated by How (Sunyatsenia 6: t. 42. 1946, as Uncaria wangii). See comments about the separation of this species under U. homomalla.
● Sparse forests, broad-leaved forests; 100-1500 m. Guangdong, Guangxi, Hainan, Sichuan, Xizang, Yunnan.