This name is a synonym of Bupleurum falcatum subsp. cernuum (Ten.) Arcang..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 1703982) with original publication details: Pflanzenr. IV 228(Heft 43): 135 1910.
This name was in version 1 of The Plant List, record tro-1703982.