⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record kew-2726434, with some changes.
This name is a synonym of Clematis occidentalis var. grosseserrata (Rydb.) J.S.Pringle.
The record derives from WCSP (in review) which reports it as a synonym with original publication details: Brittonia 23: 371 1971.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:60384-2.