This name is a synonym of Berberis ludlowii var. capillaris (Cox ex Ahrendt) Ahrendt.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: J. Bot. 79(Suppl.): 47 1941.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:106507-1.
This name was in version 1 of The Plant List, record kew-2673555, and has not been changed.