This name is a synonym of Rheum rhabarbarum L..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26001337) with original publication details: Sp. Pl. (ed. 2) 2: 531 1762.
This name was in version 1 of The Plant List, record tro-26001337, and has not been changed.