This name is a synonym of Apocynum androsaemifolium L..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 12897) with original publication details: Fl. Rocky Mts. 669 1917.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:16610-2.
This name was in version 1 of The Plant List, record kew-12897.