[plant source] this product is rue plant lime, Citrus aurantium l. and cultivated varieties or orange Citrus sinensis Osbeck dry young fruit. This product hemispherical, 3 ~ 5 cm in diameter. The epicarp brown or brown, granular, yea, the top of the spike has sunken pointlike oil chamber; Have obvious style or fruit infarction remnants of the mark. ZhongGuoPi c. cut, smooth and slightly uplift, thick 0.4 ~ 1.3 cm, scattered have edge 1 ~ 2 listed oil chamber. Qualitative hard, not easily broken. Capsule; 7 to *2 disc, a few to *5 disc, juice capsule drying shrinkage is brown to brown, built-in seeds. Slight scent, taste bitter, slightly acidic. **6 month collected from fall fruit, remove impurities, dry or low temperature drying after the extract. With qualitative hard, fragrance thick is preferred. Mainly distributed in jiangsu, zhejiang, guangdong, guizhou, sichuan, jiangxi, etc.