- Source: Bupleurum stenophyllum
Bupleurum stenophyllum is a species of Bupleurum native to Japan, Korea, and mainland China; it is also introduced to Taiwan. Its root is used as a traditional medicine in East Asia known as Radix Bupleuri (柴胡).
Some sources treat Bupleurum falcatum as a species complex incorporating many East Asian species such as Bupleurum stenophyllum, Bupleurum scorzonerifolium, and Bupleurum chinense. However, molecular studies indicate that these are all separate species.
Varieties
Bupleurum stenophyllum var. stenophyllum (2n = 26): Japan, Korea, Northeast China.
Bupleurum stenophyllum var. kiusianum Kitag. (2n = 20): Japan (Kyushu and Yamaguchi), Korea, and Northeast China.
Bupleurum stenophyllum var. leiocarpum X.J.He & C.B.Wang (2n = 26): Southwest China (Sichuan).
Bupleurum stenophyllum var. obvallatum (Nakai) Kitag.: Japan (Iki).
