This name is a synonym of Handroanthus spongiosus (Rizzini) S.O.Grose.
The record derives from iPlants
(data supplied on 2012-03-23)
which reports it as a synonym (record 318908) with original publication details: Rodriguésia 28(41): 172 1976.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:248806-2.
This name was in version 1 of The Plant List, record kew-318908, and has not been changed.