金鸡纳树 jin ji na shu

Cinchona calisaya var. ledgeriana Howard; C. ledgeriana (Howard) Bernelot Moens ex Trimen; Quinquina calisaya (Weddell) Kuntze; Q. ledgeriana (Howard) Kuntze.

Trees or shrubs, to 15(-25) m tall; bark grayish brown, thin, with many shallow fissures; branches flattened to subquadrangular, puberulent to hirtellous or glabrescent. Petiole 3-20(-30) mm, glabrous or hirtellous or puberulent; leaf blade drying papery or thinly leathery, oblong-lanceolate, elliptic-oblong, or lanceolate, 7-16(-21.5) × 2.5-6(-11) cm, both surfaces glabrous or sparsely puberulent to hirtellous abaxially, base acute to cuneate, apex obtuse to rounded or rarely acute; secondary veins 7-11 pairs, usually with crypt domatia, these best developed in proximal part of blade; stipules 10-20 mm, glabrous to puberulent or hirtellous, obtuse to rounded. Inflorescences 5-23 × 5-18 cm, densely hirtellous to puberulent; bracts triangular, 0.5-3 mm; pedicels 1-8 mm. Calyx densely sericeous; ovary portion ellipsoid, 1.5-2 mm; limb 1-2 mm, sparsely puberulent, partially lobed; lobes ovate-triangular, 0.5-1 mm. Corolla white, pale yellow, or pale pink, glabrous to puberulent outside; tube cylindrical, 5-9 mm, glabrous inside; lobes lanceolate, 3-4(-6) mm, acute. Capsules 8-30 × 3-8 mm, stiffly papery to woody, puberulent or pilosulous to glabrescent; seeds 3-10 × 1.6-3.7 mm (including wing). Fl. Jun-Feb.

Cultivated. Hainan, Taiwan, S Yunnan [native to South America (Bolivia, Peru); cultivated in tropical regions worldwide].

Plants cultivated under the trade name Cinchona ledgeriana were considered to belong to C. calisaya by Andersson (Mem. New York. Bot. Gard. 80: 55-57. 1998). The description of the plants treated as C. ledgeriana by W. C. Chen (in FRPS 71(1): 224-225. 1999) agrees with Andersson’s classification of C. lancifolia Mutis and also generally matches the cultivated hybrid C. lucumifolia Pavon ex Lindley × C. pubescens (Andersson, loc. cit.: 60).