This name is a synonym of Arundinella hirta var. aristata (Honda) Koidz..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25508934) with original publication details: Bot. Mag. (Tokyo) 36: 111 1922.
This name was in version 1 of The Plant List, record tro-25508934, and has not been changed.