This name is a synonym of Osmorhiza aristata var. longistylis (Torr.) B. Boivin.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50094876) with original publication details: Ill. Fl. N. U.S. 2: 530 1897.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:267798-2.
This name was in version 1 of The Plant List, record tro-50094876.