This name is a synonym of Malvaviscus arboreus Cav..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 19601890) with original publication details: Ann. Missouri Bot. Gard. 52(4): 522 1965.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:150448-2.
This name was in version 1 of The Plant List, record tro-19601890.