Clematis addisonii
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| Clematis addisonii | |
|---|---|
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| Clematis addisonii in bloom | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Order: | Ranunculales |
| Family: | Ranunculaceae |
| Genus: | Clematis |
| Species: | C. addisonii |
| Binomial name | |
| Clematis addisonii Britton | |
| Synonyms[1] | |
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Clematis addisonii, commonly known as Addison's leatherflower or Addison's virgin's-bower, is a rare species of flowering plant in the family Ranunculaceae. It is endemic to western Virginia in the United States, where it occurs in calcareous woodlands and barrens.[2]
Clematis addisonii is an herbaceous perennial with ascending to erect stems typically 0.6–1 m in length, occasionally somewhat viney.[2]
Leaves are mostly simple, though distal leaves on vigorous plants may be 1-pinnate. Leaflets (when present) are ovate, unlobed, and not prominently reticulate. The lower leaf surface is characteristically glaucous and glabrous.[2]
Flowers are solitary, borne terminally or axillary, and are ovoid to broadly urn-shaped. Sepals are purple to reddish-purple, often paling toward the tips, and measure 1.2–2.5 cm long.[2]
Taxonomy
The species was first described by Nathaniel Lord Britton in 1890.[1]
It has historically been placed in the genus Viorna as Viorna addisonii (Britton) Small, reflecting its placement within Clematis subgenus Viorna.[1]
Distribution and habitat
Clematis addisonii is restricted to Botetourt, Montgomery, Roanoke, and Rockbridge counties in western Virginia.[2]
It occurs in dry to mesic calcareous woodlands, barrens, and rock outcrops, typically over dolostone of the Elbrook Formation.[3]
The species is typically found at elevations of approximately 200–600 m.[2]
Ecology
Conservation
Clematis addisonii is ranked as G1–G2 (critically imperiled to imperiled) by NatureServe, with a rounded status of G1.[4]
The species is known from a small number of populations, with approximately 6–20 occurrences and about 11 documented in recent decades.[4]
Major threats include habitat loss, development, invasive species, deer browsing, and habitat fragmentation.[4]
The species is endemic to a narrow range and has experienced population declines over time.[4]
It has been reviewed multiple times for potential listing under the U.S. Endangered Species Act but is not currently federally listed.[5]