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 50064716) with original publication details: Acta Congr. Bot. Amst. 1877: 212 1879.
This name was in version 1 of The Plant List, record tro-50064716, and has not been changed.