This name is a synonym of Asclepias jamesii Torr..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name with original publication details: Mem. Torrey Bot. Club 5: 263 1894.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:21224-2.
This name was in version 1 of The Plant List, record kew-2654903, and has not been changed.