Bell-shaped flowers, yellow inside but red-purple outside. According to the International Clematis Register and Checklist 2002, this form was collected by David Hummel from Central Asia in 1929.

Group: Tangutica group
Parentage: Selection from intricata
Other name(s): intricata var phaeantha 'David Hummel'

Further detail:

Tepals: 4
Leaves: 2-ternate