This name is a synonym of Desmodium triangulare var. congestum (Prain) Santapau.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13073035) with original publication details: J. Asiat. Soc. Bengal 66: 389 1898.
This name was in version 1 of The Plant List, record tro-13073035.