This beautiful Clematis is Clematis addisonii which is native to only four counties in the western part of Virginia USA. Its native habitat is dry woods, glades, rock outcrops in soil that is calcareous. The flowers are solitary, urn shaped, purple to reddish purple with creamy tips. Flowering time is spring to early summer. A bushy subshrub with an erect to sprawling habit, about 2-3 feet (60-100cm) tall.