This name is a synonym of Dioon sonorense (De Luca, Sabato & Vázq.Torres) Chemnick, T.Greg. & Salas-Morales.
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 383591) with original publication details: in Fl. Novo-Galiciana 17: 112 1992.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1015235-2.
This name was in version 1 of The Plant List, record kew-2769008.