A resinous, astringent extract obtained from the leaves of a woody vine(Uncaria gambir)of Malaysia and Indonesia, used medicinally and in tanning and dyeing.

• 黑儿茶，棕儿茶从木质藤本植物（黑儿茶钩滕属）的枝叶中提取的含树脂的止血物质，产于马来西亚和印度尼西亚，用于医药、制革和印染