This name is a synonym of Sambucus racemosa f. rosaeflora (Carrière) Scoggan.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50121162) with original publication details: Naturaliste Canad. 93(4): 437 1966.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:293521-2.
This name was in version 1 of The Plant List, record tro-50121162, and has not been changed.