This name is a synonym of Handroanthus albus (Cham.) Mattos.
The record derives from iPlants
(data supplied on 2012-03-23)
which reports it as a synonym (record 318726) with original publication details: Lilloa 14: 136 1948.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:248614-2.
This name was in version 1 of The Plant List, record kew-318726, and has not been changed.