This name is a synonym of Triphora trianthophora subsp. mexicana (S.Watson) Medley.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 344977) with original publication details: N. Amer. Native Orchid J. 12: 7 2006.
This name was in version 1 of The Plant List, record kew-344977, and has not been changed.