This name is a synonym of Cyanthillium cinereum (L.) H.Rob..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 4A57BA7B-EFAA-4511-ACE3-9B1177FA6385) with original publication details: 6 Dec 1834.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:258696-1.
This name was in version 1 of The Plant List, record gcc-100636.