Rehmannia refers to the root of Rehmannia glutinosa, an herb of the Scrophulariaceae family. The species name glutinosa comes from glutinous, referring to the sticky nature of the root. Rehmannia is closely related to another herb that carries the name of the plant family, Scrophularia ningpoensis, for which the root is also used in China. The claimed therapeutic effects and recommended uses of the two herbs are quite similar, but rehmannia is far more frequently prescribed. Also in this plant family is Picrorrhiza kurrooa, for which the root is used in Chinese medicine; some of its actions are related to those of the other two herbs.
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