|Clematis 'Bill MacKenzie' is also sometimes listed as C. orientalis 'Bill Mackenzie'. The American Horticultural Deciduous, vigorous climber belonging to AHS group 3. Small, 3 inch wide midsummer to late fall flowers are borne on present year's growth. Blooms are followed by showy, woolly seed heads. Leaves are pinnate and divided into lance-shaped leaflets, 3/4 to 6 inches long. Beautiful along fences and arbors. The plant base should receive part to full shade.