This name is a synonym of Brassica nigra (L.) K.Koch.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 100358210) with original publication details: Syn. Fl. West. States 2: 207 1806.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:289093-1.
This name was in version 1 of The Plant List, record tro-100358210.