This name is a synonym of Opuntia pycnantha Engelm..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 5108123) with original publication details: Cact. Succ. J. (Los Angeles) 2: 388 1931.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:136784-1.
This name was in version 1 of The Plant List, record tro-5108123, and has not been changed.