Herbal Exhibition
Rhizoma Alismatis
Oriental Waterplantain Rhizome


The tuber of Alisma orientale (Sam.) Juzepcz (Fam. Alismataceae).

Mainly in Chinese proviuces such as Fujian, Sichuan and Jiangxi.

Harvest & Processing
Dig out tubers in winter; remove leaves and fibrous roots, and shave off cork; wash tubers clean; dry by heat. Alternatively, put tubers in a bamboo basket to remove fibrous roots and cork; dry under the sun.

Subspherical, ellipsoid (elliptical in long-section and circular in cross-section) or obovoid (inverse egg-shaped); 2-7 cm long, 2-6 cm in diameter; outer surface yellowish-white or pale yellowishbrown. For tubers with cork remnants, outer surface pale brown and marked with irregular, shallow transverse annulations and numerous small, protuberant scars of fibrous roots; both annulations and scars especially dense at the bottom. Hard and solid; when broken, surface yellowish-white, starchy, poriferous (with numerous pores). Odour: faint; taste: slightly bitter.

1. Nephritic oedema, pyelitis, dysuria
2. Enteritis, diarrhoea

Chemical Composition
Mainly contains triterpenes such as alisol A, B, C.


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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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