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 383602) with original publication details: Brittonia 36: 226 1984.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:315002-2.
This name was in version 1 of The Plant List, record kew-2769019.