This name is a synonym of Bupleurum falcatum subsp. cernuum (Ten.) Arcang..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Monogr. Bupleur. Alp. 93 1897.
This name was in version 1 of The Plant List, record kew-2686599.