This name is a synonym of Sphenomeris clavata (L.) Maxon.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26604063) with original publication details: Sp. Pl. 2: 1096 1753.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:4892-2.
This name was in version 1 of The Plant List, record tro-26604063, and has not been changed.