This name is a synonym of Chasmanthium laxum (L.) H.O.Yates.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 449298) with original publication details: Encycl. 8: 185 1808.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:310433-2.
This name was in version 1 of The Plant List, record kew-449298.