Clematis viorna (Vase-vine Leatherflower) Clematis viorna, commonly known as vasevine or leatherflower, is a flowering vine native to the southeastern United States. It grows in wooded habitats and bears purple flowers in spring and summer. Source: https://www.inaturalist.org/observations/81615650 Related By Wade Hi. I’m Wade Murray, and like everyone with a personal website, mine is horribly, terribly out of date. On the Internet my handle is normally wademurray, but you can still find blime in some of the older dustier places. View all of Wade's posts.