This name is a synonym of Phemeranthus parviflorus (Nutt.) Kiger.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50203691) with original publication details: Taxon 46(2): 222 1997.
This name was in version 1 of The Plant List, record tro-50203691, and has not been changed.