This name is a synonym of Blackstonia perfoliata subsp. intermedia (Ten.) Zeltner.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Mem. Real Soc. Esp. Hist. Nat. 14: 462 1934.
This name was in version 1 of The Plant List, record kew-2676919, and has not been changed.