This name is a synonym of Apocynum androsaemifolium subsp. pumilum (A.Gray) B.Boivin.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name (record 12905) with original publication details: Atti Reale Accad. Lincei 5(9): 97 1913.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:77205-1.
This name was in version 1 of The Plant List, record kew-12905, and has not been changed.