This name is a synonym of Notholithocarpus densiflorus var. echinoides (R.Br.ter) Manos, Cannon & S.H.Oh.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 172605) with original publication details: Ann. Mag. Nat. Hist. IV, 7: 251 1871.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:215805-2.
This name was in version 1 of The Plant List, record kew-172605.