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 50097215) with original publication details: Bot. Gaz. 16: 237 1891.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:250133-2.
This name was in version 1 of The Plant List, record tro-50097215, and has not been changed.