This name is a synonym of Laelia speciosa (Kunth) Schltr..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 454743) with original publication details: Amer. Gardening 22: 398 1901.
This name record (from WCSP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Laelia grandiflora in version 1 of The Plant List.