This name is a synonym of Clermontia oblongifolia subsp. mauiensis (Rock) Lammers.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 367720) with original publication details: Fl. Hawaiiensis 339: s.p. 1937.
This name was in version 1 of The Plant List, record kew-367720, and has not been changed.