This name is a synonym of Handroanthus heptaphyllus (Vell.) Mattos.
The record derives from iPlants
(data supplied on 2012-03-23)
which reports it as a synonym (record 320007) with original publication details: Fl. Flumin. 251 1825 publ. 1829.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:32892-2.
This name was in version 1 of The Plant List, record kew-320007.