This name is a synonym of Euphorbia falcata subsp. macrostegia (Bornm.) O.Schwartz.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 79635) with original publication details: Mitth. Thüring. Bot. Vereins n.f., 24: 111 1908.
This name was in version 1 of The Plant List, record kew-79635, and has not been changed.