This name is a synonym of Conimitella williamsii (D.C.Eaton) Rydb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50097216) with original publication details: Erythea 3(6): 102 1895.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:141759-2.
This name was in version 1 of The Plant List, record tro-50097216, and has not been changed.