This name is a synonym of Pachyrhizus tuberosus (Lam.) Spreng..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13003159) with original publication details: Sci. Surv. Porto Rico & Virgin Islands 5: 424 1924.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:39478-2.
This name was in version 1 of The Plant List, record tro-13003159, and has not been changed.