Fructus japonica is also known as kidney fern, round fern, etc. It is mostly grown in the stone gaps beside streams in the forest. It is a plant of the genus Kidney fern in the family Drynariaceae. Its spherical tubers or whole plants are used for medicinal purposes. It can be harvested all year round, remove the scales, wash and use fresh or dry in the sun for later use.

Summer fruit Huangpi is the fruit of Rutaceae plant Huangpi, while Shihuangpi is the round tuber of kidney fern. They are two different species of plants, but their medicinal effects There are similarities.

Huangpi has a sweet and sour taste, is warm in nature, and has the functions of digestion, resolving phlegm, and regulating qi. It can treat excessive food accumulation, phlegm, and cough due to excessive phlegm; the herbal medicine Shihuangpi has a sweet and light taste, slightly astringent, slightly cool in nature, and has functions It clears away heat and dampness, calms the lungs and relieves cough, and also has the effect of eliminating accumulation.