This name is a synonym of Rorippa atrovirens f. obtusula (Miq.) Ohwi & H. Hara.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50248206) with original publication details: J. Jap. Bot. 11(9): 624 1935.
This name was in version 1 of The Plant List, record tro-50248206.