Bupleurum falcatum Sickle-leaved Hare's-ear
Also known as Chinese Thorowax, Bupleurum falcatum is native in Asia and Europe although very occasionally it has been recorded in the UK. It is a large umbellifer unlike some of the other rather small species in this genus.
A decoction (usually boiling with water) of the roots is used as a herb with other ingredients to cure digestive and liver complaints in the far east.