This name is a synonym of Zanthoxylum punctatum subsp. obtriangulare (Urb.) Reynel.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50100042) with original publication details: Rhodora 62: 237 1960.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:270736-2.
This name was in version 1 of The Plant List, record tro-50100042, and has not been changed.