鸡纳树 ji na shu

Cinchona succirubra Pavon ex Klotzsch.

Trees and shrubs, to 12 m tall; bark grayish brown, sometimes striped with white and/or longitudinally fissured; branches somewhat flattened to subterete or angled, densely pilosulous or hirtellous to puberulent or glabrescent. Petiole 1.5-4 cm, glabrous or puberulent to hirtellous; leaf blade drying papery, ovate, ovate-elliptic, or elliptic-oblong, 10-24.5 × 5.5-17 cm, adaxially glabrous to pilosulous or puberulent, abaxially hirtellous to pilosulous or puberulent and often reddened at least when young, base obtuse to rounded or truncate, apex obtuse to rounded; secondary veins 6-11 pairs, with pilosulous domatia; stipules 10-25 mm, sparsely pilosulous, obtuse to rounded. Inflorescences 6-23 × 6-23 cm, pilosulous or hirtellous to puberulent; bracts triangular, 0.5-3 mm; pedicels 1-3 mm. Calyx with ovary portion ellipsoid, 2-3 mm, densely pilosulous; limb 1.5-3 mm, sparsely to densely pilosulous or hirtellous, shallowly lobed; lobes triangular, 0.5-1 mm. Corolla white or pink, outside glabrescent to pilosulous or puberulent; tube cylindrical, 8.5-14 mm; lobes ovate-lanceolate, 4-6 mm, acute. Capsules 10-18(-41) × 5-7 mm, pilosulous to glabrescent; seeds 7-12 × 2-3 mm (including wing). Fl. and fr. Jun-Feb.

Cultivated. Guangxi (Nanning), Hainan, Taiwan, S Yunnan [native to Central America (Costa Rica) and South America (Bolivia, Colombia, Ecuador, Peru, Venezuela); often cultivated in tropical regions worldwide].

This is the most frequently cultivated species and hybrid parent of Cinchona. It is variable morphologically in cultivation and also in its native range.