Vascular Plants of North Carolina
Account for Vasevine Leatherflower - Clematis viorna   L.
Members of Ranunculaceae:
Members of Clematis with account distribution info or public map:
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Section 6 » Order Ranunculales » Family Ranunculaceae
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AuthorL.
DistributionThroughout the Mountains and Piedmont; barely ranging into the Coastal Plain, though disjunct to the central coast in marl-dominated habitats. Apparently ranges barely into the western Coastal Plain along the Cape Fear River and Little River.

This is an East-central species, ranging north just to southern PA and MO, and then south to southern GA and AR.
AbundanceFrequent to common across the Mountains and Piedmont, generally just slightly less numerous in these regions than is C. virginiana. Very rare in the Coastal Plain -- extreme western margins and in the Jones/Onslow county region, but absent in most areas.
HabitatThis is a species of mesic forests and edges, preferably over circumneutral soil or just barely acidic soil. It favors edges and openings, in partial shade; thus, it is most often seen in open mesic hardwood forests, edges of hardwood forests, glades and barrens, and in mesic to slightly damp thickets. It can occur in rocky wooded soils and open rock ledges.
PhenologyBlooms from May to September, and fruits shortly after flowering.
IdentificationThis is another of the herbaceous vines in the genus, it often reaching to 10 feet or more long. It has opposite leaves, each of which is pinnately-divided into 3-9 leaflets. Each leaflet is ovate to lanceolate, about 2 inches long, entire on the margins, but some may be strongly cleft and not simply just ovate. The scattered flowers are mostly solitary at a branch tip or from a leaf axil. Each is purple-rose in color, the usually 4 sepals (no petals) being very thick and fleshy, with the shape of the 1-inch-long flower being a "closed-looking" vase or urn with slightly turned up sepal tips, usually facing downward. When in bloom, the purplish color of the flowers are quite obvious, but when just in leaf you could walk past it without noticing. The only other similar species in its range with these entire leaflets is the exotic C. terniflora; it normally grows in strongly disturbed or waste areas, but habitats can overlap. The flowers are very different, as that species has white flowers in clusters and widely spread, as in C. virginiana. The Coastal Plain C. crispa may overlap in range, barely; its leaves are very similar, but it has blue flowers with wide-spreading sepal tips in a bell shape. All of these species have the characteristic "curly-heads" ball of fruit, often 2 inches across; though easily spotted on the vines, they usually are not helpful in distinguishing among the other Clematis species. This is a species that should be readily found by biologists working in the mountains and Piedmont along wooded edges, wide trail margins though forests, and other lightly-shaded areas in mesic -- yet in rich-soil -- conditions.
Taxonomic CommentsNone

Other Common Name(s)Vase-vine, Northern Leatherflower. The species is often called just "Leather-flower", but quite a few other species in the genus have that as part of the common name, and thus that name is not acceptable for C. viorna. Many use Vase-vine, a suitable name, though that is idiosyncratic. NatureServe uses Vasevine Leatherflower, which this website adopts as being the best name.
State RankS5
Global RankG5
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