This name is a synonym of Oonopsis engelmannii (A.Gray) Greene.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 4240090C-8470-4130-8138-F4398CCB566C) with original publication details: Revis. Gen. Pl. 1: 317 (1891) 317 1891.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:180638-1.
This name was in version 1 of The Plant List, record gcc-140112, and has not been changed.