This name is a synonym of Hordeum murinum subsp. leporinum (Link) Arcang..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 25527845) with original publication details: Pl. Eur. 1: 130 1890.
This name was in version 1 of The Plant List, record tro-25527845.