This name is a synonym of Isatis glauca subsp. exauriculata (Bornm.) P.H. Davis.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 100358401) with original publication details: Mant. 30: 56 1931.
This name was in version 1 of The Plant List, record tro-100358401.