This name is a synonym of Aruncus dioicus (Walter) Fernald.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 27804152) with original publication details: J. Jap. Bot. 30(3): 68 1955.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:60445157-2.
This name was in version 1 of The Plant List, record tro-27804152.