This name is a synonym of Apocynum cannabinum L..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 329875) with original publication details: Rev. Monogr. Apocynum 108 1913.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:16533-2.
This name was in version 1 of The Plant List, record kew-329875.