This name is a synonym of Amorpha canescens Pursh.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13056519) with original publication details: Rhodora 38(449): 191 1936.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:11412-2.
This name was in version 1 of The Plant List, record tro-13056519.