This name is a synonym of Daphnopsis cuneata subsp. uniflora (Urb. & Ekman) Nevling.
The record derives from WCSP (in review)
(data supplied on 2012-03-26)
which reports it as a synonym with original publication details: Ark. Bot. 21A(5): 16 1927.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:76764-2.
This name was in version 1 of The Plant List, record kew-2757469, and has not been changed.