Clematis potaninii Maxim.

Woody climber. Leaves mostly twice divided into 3. Leaflets lobed or toothed. Flowers 1-several, axillary; summer. Perianth segments 6, spreading, downy outside. Styles feathery. [c. fargesii Franch.]

SW China

var. souliei Finet & Gagnep. Flowers slightly larger. [C. fargesii Franch. var. souliei Finet &Gagnep.]

Source: Gubbins, B.; Spencer, R. (1997). Clematis. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Ranunculanae
order      Ranunculales
family       Ranunculaceae
genus        Clematis L.