⚠ Version 1 of The Plant List has been superseded.
This name record (from Tropicos) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Clematis angustifolia in version 1.1 of The Plant List.
This name is a synonym of Clematis hexapetala var. hexapetala .
The record derives from Tropicos which reports it as a synonym (record 27104330
) with original publication details: Higasi-Moko Syokubutsu Mokuroku 14 14 1917.