This name is a synonym of Rheum compactum L..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50136360) with original publication details: Fl. Ross. 1(index 2): 2 1788.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:696767-1.
This name was in version 1 of The Plant List, record tro-50136360, and has not been changed.