This name is a synonym of Lupinus argenteus Pursh.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13014598) with original publication details: Sp. Lupinorum 43: 749, f. sn 1952.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:145944-2.
This name was in version 1 of The Plant List, record tro-13014598.