This name is a synonym of Desmodium arizonicum S.Watson.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13015045) with original publication details: Bull. Torrey Bot. Club 19(4): 117 1892.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:155884-2.
This name was in version 1 of The Plant List, record tro-13015045, and has not been changed.