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 318912) with original publication details: Arq. Bot. Estado São Paulo n.s., 3: 34 1952.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:288917-2.
This name was in version 1 of The Plant List, record kew-318912, and has not been changed.