This name is a synonym of Arrhenatherum elatius f. flavescens (P. Niels. ex Lange) Holmb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25559303) with original publication details: Haandb. Danske Fl. (ed. 4) 4: 79 1886.
This name was in version 1 of The Plant List, record tro-25559303, and has not been changed.