This name is a synonym of Monanthes laxiflora (DC.) Bolle ex Bornmuller.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8903003) with original publication details: Prodr. 3: 409 1828.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:275599-1.
This name was in version 1 of The Plant List, record tro-8903003.