This name is a synonym of Lepidium lasiocarpum Nutt..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50146734) with original publication details: Madroño 8(4): 136–137 1945.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:138045-2.
This name was in version 1 of The Plant List, record tro-50146734.