Clematis occidentalis
 Clematis occidentalis is a species of flowering plant in the buttercup family known by the common name western blue virginsbower. It is native to much of southern Canada and the northern United States. There are three varieties: var. occidentalis is limited to the eastern half of the species' range var. grosseserrata to the western half and var. dissecta is endemic to Washington. The plant varies somewhat in appearance. Generally they produce vines and climb on surfaces.