Bupleurum is an important herb used in traditional Chinese and Japanese medicine. The name is from the greek word boupleuros meaning Oxen rib. Remove the small side laterals and use as a filler for small vase arrangements and bridal bouquets. Bupleurum is a thick and vivid filler greenery, marked by its small clusters of oval-shaped leaves with spike-like tips and small, sunny-yellow flowers that smile back at you.