The stem with scales are used in treating impotence, infertility, for coldness and pain in the lower back and knee, and for constipation due to dry intestine. It is used to reinforce the vital function of kidney and to influence fertility, leukorrhea and metrorrhagia in women.
Reference
Jing-Nuan Wu. An Illustrated Chinese Materia Medica. P: 190, Oxford University Press, Inc.2005.