This name is a synonym of Malacothamnus fasciculatus (Nutt. ex Torr. & A. Gray) Greene.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50092137) with original publication details: Fl. N. Amer. 1(2): 225–226 1838.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:561657-1.
This name was in version 1 of The Plant List, record tro-50092137.