This name is a synonym of Poenosedum tuberosum (Coss. & Letell.) Holub.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8900065) with original publication details: Bull. Soc. Bot. France 22: 9 1875.
This name was in version 1 of The Plant List, record tro-8900065, and has not been changed.