This name is a synonym of Wendlandia tinctoria subsp. floribunda (Craib) Cowan.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 214434) with original publication details: Bull. Misc. Inform. Kew 1911: 386 1911.
This name was in version 1 of The Plant List, record kew-214434, and has not been changed.