This name is a synonym of Tibouchina gracilis (Bonpl.) Cogn..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50082507) with original publication details: U.S. Expl. Exped., Phan. 604 1854.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1168474-2.
This name was in version 1 of The Plant List, record tro-50082507.