This name is a synonym of Rhynchostegiella sericeonitida (Sakurai) Sakurai.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 35114806) with original publication details: Bot. Mag. (Tokyo) 51: 13 1937.
This name was in version 1 of The Plant List, record tro-35114806, and has not been changed.