This name is a synonym of Hibiscus platycalyx Mast..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 19602113) with original publication details: Veg. Erde 9, band 3 # 2: 397 1921.
This name was in version 1 of The Plant List, record tro-19602113, and has not been changed.