This name is a synonym of Arundinella hirta var. oxyantha (Franch. & Sav.) Koidz..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25508940) with original publication details: Enum. Pl. Jap. 2(1): 165 1877.
This name was in version 1 of The Plant List, record tro-25508940, and has not been changed.