Herbs that Tonify Qi

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Besides tonifying qi, what is another important function of Shan Yao (dioscorea rhizoma)?

Secures Kidney essence; for frequent urination, seminal emission, and vaginal discharge
Clears heat toxicity; for carbuncles, boils, and sores
Clears summerheat; especially for diarrhea and vomiting
Tonifies Heart blood to calm shen; for irritability and insomnia

We don't really say that Shan Yao "induces astringency", but it does have an action of securing essence to stop Kidney leakage, as in Shen Qi Wan (Kidney Qi Pill).

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. p. 724 [Q73]