This name is a synonym of Physaria grahamii C.V. Morton.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 4103070) with original publication details: Contr. Gray Herb. 214: 11–13 1984.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:195591-2.
This name was in version 1 of The Plant List, record tro-4103070, and has not been changed.