Herbal Exhibition
Radix Isatidis
Isatis Root
Banlangen

Source
The root of Isatis indigotica Fort. (Fam. Cruciferae).

Distribution
Mainly in Chinese provinces such as Hebei and Jiangsu. Introduced to and cultivated in most regions of China.

Harvest & Processing
Dig out roots in autumn; remove stemsand leaves; wash clean and dry under the sun; store in cool, dry places.

Description
Cylindrical, slightly twisted; 10-20 cm long, 0.5-1 cm in diameter. Outer surface pale greyish-yellow or pale brownish-yellow, marked with longitudinal wrinkles, transverse lenticels and branch roots or branch root scars; top part slightly bulgy, with verticillate (arranged in whorls) dull green or dull brown remnants of petiole base, petiole scars and dense verruciform (wart-shaped) protuberances. Solid and slightly brittle. When broken, surface fairly even; bark yellowish-white, occupying about 1/2-3/4 of radius; xylem yellow.

Indications
1. Seasonal febrile diseases, pestilence
2. Mumps and other eruptive exanthem
3. Aphthous ulcer, sore throat

Chemical Composition
Mainly contains indigotin and indirubin.

Photos

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The information and images in this Online Herbal Exhibition is form the book, "An Illustrated Chinese Materia Medica in Hong Kong", edited by Professor Zhao Zhongzhen, School of Chinese Medicine, Hong Kong Baptist University. For the complete collection of Chinese Materia Medica compiled by Professor Zhao, please go to this website: http://www.bucmm.org.

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