This name is a synonym of Rheum kialense Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50136406) with original publication details: Svensk Bot. Tidskr. 30: 718 1936.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:696758-1.
This name was in version 1 of The Plant List, record tro-50136406, and has not been changed.