⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record kew-2726432, with some changes.
This name is a synonym of Clematis columbiana (Nutt.) Torr. & A.Gray.
The record derives from WCSP (in review) which reports it as a synonym with original publication details: Bot. Gaz. 29: 281 1900.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:60383-2.