Calyx cup-shaped, almost truncate, outside pulverulent pubescent.

花萼杯状，几乎截形，外面粉状。

Young stems terete to frequently 4-angled or subalate, glabrous, puberulous, pubescent, or tomentose, often glabrescent.

嫩茎圆柱状到经常地四棱形或略似翼的，无，微，，或绒的，通常后脱落。

Leaflet blades villous. Leaflet blades and fruit slightly larger than those of autonym variety.

小叶叶片具长。小叶叶片和果比原变的稍大。

Petals lorate, to 2 mm, pubescent on parts exposed in bud.

带状的花瓣，在2毫米，在芽中暴露部分。

Branchlets pubescent to glabrescent with minute scurfy hairs intermixed with unguicular scales.

小枝具到后脱落有微小的鳞屑与具爪鳞片混生的。

Ovary of female flower 2(or 3)-locular, densely yellow-brown pubescent.

雌花的子房室2(或3)，棕色。

Anthocarp clavate, 3-3.5 mm, 5-ribbed, with viscid glands and sparse pubescence, apex rounded.

假果棍棒状，3-3.5毫米，5肋，具粘的腺体和稀少，先端圆形。

Shrubs or small trees, usually erect, rarely viny or climbing, glabrous, rarely pubsecent, branches often inermous.

灌木或小乔木，通常直立，很少倾斜或攀援的，无，很少，枝经常无刺。

Stipular film is qualitative, elliptical shape wraps around needle form, grow 7-15 millimeter, tip gradually pointed, the brim has gland a tooth-like part of anything, edge nervation by fluff.

托叶膜质,椭圆状披针形,长7-15毫米,先端渐尖,边缘具腺齿,沿叶脉。

Definition: Whole or cut, dried bark of Cinchona pubescens Vahl (Cinchona succirubra Pavon), of C. calisaya (Weddell), of C. ledgeriana (Moens ex Trimen) or of its varieties or hybrids.

本品为茜草科植物金鸡纳（鸡纳树）Cinchona pubescens Vahl (Cinchona succirubra Pavon)、白金鸡纳树C. calisaya (Weddell)、金鸡纳树C. ledgeriana (Moens ex Trimen)及其变及杂交品的完整或切段的干燥树皮。