This name is a synonym of Plumeria rubra l x p subsessilis A. DC..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50326265) with original publication details: Ark. Bot. 17(7): 50 1921.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:204006-2.
This name was in version 1 of The Plant List, record tro-50326265.