This name is a synonym of Handroanthus vellosoi (Toledo) Mattos.
The record derives from iPlants
(data supplied on 2012-03-23)
which reports it as a synonym (record 317149) with original publication details: Loefgrenia 100: 3 1991.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:963457-1.
This name was in version 1 of The Plant List, record kew-317149, and has not been changed.