This name is a synonym of Handroanthus pulcherrimus (Sandwith) S.O.Grose.
The record derives from iPlants
(data supplied on 2012-03-23)
which reports it as a synonym (record 318888) with original publication details: Lilloa 14: 134 1948.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:248779-2.
This name was in version 1 of The Plant List, record kew-318888, and has not been changed.