This name is a synonym of Lepidium ramosissimum A. Nelson.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 4100200) with original publication details: Mitt. Bot. Mus. Univ. Zürich 28: 237 1906.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:311338-2.
This name was in version 1 of The Plant List, record tro-4100200.