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: Nov. Gen. Sp. 2: 194 1818.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:59646-1.
This name was in version 1 of The Plant List, record kew-2633056, and has not been changed.