This name is a synonym of Plagiobothrys fulvus (Hook. & Arn.) I.M. Johnst..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50122020) with original publication details: Prodr. 10: 132 1846.
This name was in version 1 of The Plant List, record tro-50122020, and has not been changed.