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 50095013) with original publication details: Bot. Gaz. 15(3): 62 1890.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:121695-2.
This name was in version 1 of The Plant List, record tro-50095013, and has not been changed.