This name is a synonym of Desmodium rotundifolium f. glabratum (A. Gray) B.G. Schub..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13064383) with original publication details: Man. ed. 5: 135 1867.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:78563-2.
This name was in version 1 of The Plant List, record tro-13064383, and has not been changed.