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 711FD627-660B-41EC-9EE4-53FF128B303D) with original publication details: 25 1836.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:258307-1.
This name was in version 1 of The Plant List, record gcc-45326.