Not an accepted name (status: rejected). The accepted name is Cynanchum viminale subsp. viminale 1771.

Apocynum viminale Bassi ex Roem. & Schult. 0% complete

No common name

Systema Vegetabilium 6: 113. 1820. (Aug-Dec 1820) (Syst. Veg. (ed. 15 bis))

There is no corrections for Apocynum viminale yet.