This name is a synonym of Amaranthus hybridus subsp. quitensis (Kunth) Costea & Carretero.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Butl. Inst. Catalana Hist. Nat., Secc. Bot. 38: 89 1974.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:874102-1.
This name was in version 1 of The Plant List, record kew-2633067, and has not been changed.