Clematis terminalis

Clematis terminalis, the Pine Mountain leatherflower, is a species of flowering plant in the family Ranunculaceae. It is endemic to the Pine Mountain Ridges of west-central Georgia.^{[2] [3] [4]}

Clematis terminalis is a perennial woody plant in the Clematis subgenus Viorna. Unlike most members of the Clematis viorna species complex, it exhibits an erect to ascending habit during the flowering period, becoming more scandent later in the growing season.^[1]

The species produces nodding, urn-shaped flowers typical of the complex. These are borne primarily in terminal positions and are solitary and ebracteate during the main flowering period, distinguishing it from related taxa which bear axillary, bracteate flowers.

The species was formally described in 2022 by T.H. Murphy, A. Floden, and D.E. Estes as part of a taxonomic revision of the Clematis reticulata complex using morphometric and molecular data.^[1]

It is placed within Clematis subgenus Viorna, a group of primarily southeastern North American species characterized by nodding, campanulate flowers.

Clematis terminalis is restricted to the Pine Mountain Ridges of the Georgia Piedmont, where it occurs in dry, ridgetop oak–hickory–pine woodlands.^{[1] [4]}

It grows in gravelly, sandy soils derived from quartzite formations and is associated with open woodland communities historically maintained by frequent fire.^[1]

Flowering occurs from mid-April to early May, earlier than many related species in the complex.^[4]

Clematis terminalis can be distinguished from other members of the Clematis reticulata species complex by a combination of growth form, inflorescence position, leaf morphology, and geographic distribution.

• Clematis reticulata (sensu stricto) differs in its consistently vining habit, axillary inflorescences, and thicker, more coriaceous leaflets with dense reticulate venation. It is also primarily restricted to the Coastal Plain.^{[4] [5]}
• Clematis subreticulata differs in being consistently vining with primarily axillary, bracteate flowers.^{[4] [5]}
• Clematis arenicola differs in being a vining species of the West Gulf Coastal Plain, with axillary, bracteate flowers and coriaceous leaves adapted to xeric sandy habitats.^{[4] [5]}
• Clematis ouachitensis differs in its restriction to the Ouachita Mountains and in having short, pendulous pedicels with axillary flowers.^{[4] [5]}
• Clematis cumberlandensis differs in having long, erect pedicels bearing axillary flowers, as well as differences in sepal coloration and achene morphology.^{[4] [5]}

Clematis terminalis is ranked as G1 (critically imperiled), reflecting its extremely limited range and very small population size.^[1] Currently, only two occurrences are known, with fewer than 50 individuals documented globally.^[1]

The species is threatened primarily by fire suppression, which has led to increased canopy closure and reduced flowering. Historically, the Pine Mountain ecosystem experienced frequent fires at intervals of approximately 1–3 years, and restoration of such fire regimes is considered essential for the species' persistence.^[1]

Additional threats include potential habitat loss at unprotected sites. Ongoing surveys are recommended to locate additional populations, particularly in similar ridge systems in Georgia and adjacent Alabama.^[1]

• NatureServe critically imperiled species
• Endemic flora of the United States
• Flora of the Southeastern United States
• Endemic flora of Georgia (U.S. state)
• Flora of the United States
• Plants described in 2022
• Clematis

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