Clematis viticaulis - Steele
Millboro Leatherflower
Other Common Names: Millboro leather flower
Taxonomic Status: Accepted
Related ITIS Name(s): Clematis viticaulis Steele (TSN 18718)
Unique Identifier: ELEMENT_GLOBAL.2.134546
Element Code: PDRAN08110
Informal Taxonomy: Plants, Vascular - Flowering Plants - Buttercup Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Ranunculales Ranunculaceae Clematis
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Clematis viticaulis
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 22Jan2013
Global Status Last Changed: 22Jan2013
Ranking Methodology Used: Ranked by inspection
Rounded Global Status: G1 - Critically Imperiled
Reasons: A strict shale barren endemic, known only from portions of Bath, Augusta, and Rockbridge counties in western Virginia. About 18 extant occurrences are known (20+ estimated) and the total global population is estimated at 1500-2500 individuals. Stable and thriving at known sites, many of which are self-maintained and unthreatened in the foreseeable future. However, confined to a specialized habitat within a very small range.
Nation: United States
National Status: N1

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States Virginia (S1S2)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Total range is within two (or historically three) counties in Ridge and Valley physiographic province of Virginia.

Number of Occurrences: 6 - 80
Number of Occurrences Comments: Eighteen extant occurrences known (6/99); a few more likely to be gained with habitat survey; estimated total of 19-24.

Population Size Comments: Global population 1500-2500 individuals, with two sites each having >500 individuals and five others with >100 individuals in recent years (Steve Kelleffer, VaHP, 6/99).

Number of Occurrences with Good Viability/Integrity: Few (4-12)
Viability/Integrity Comments: Several of the occurrences are considered to have good viability.

Overall Threat Impact Comments: Threat to species shale barren habitat extremely low. Herbivory may pose minor threat. Maintenance or widening of roads or railroads could threaten some sites. Logging or grazing in adjacent areas considered unlikely to impact sites substantially especially on sites which are quite steep. Interspecific factors such as competition and predation are reported (Southern Appalachian Species Viability Project 2002).

Short-term Trend: Relatively Stable (<=10% change)
Short-term Trend Comments: Better sites (approximately 13 sites) apparently stable; no noticeable changes in past decade (Steve Kelliffer, VaHP, 6/99).

Intrinsic Vulnerability Comments: Fragility relatively high due to steep shale slopes eroding easily from footsteps. Establishment of new plants from seed probably quite rare, but established plants likely to be long-persisting.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Total range is within two (or historically three) counties in Ridge and Valley physiographic province of Virginia.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States VA

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
VA Bath (51017), Rockbridge (51163)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
02 Upper James (02080201)+, Maury (02080202)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: An erect, perennial herb, 3-5 dm tall, with leathery, yellow-green leaves. Flowers (May-early June) lack petals but have sepals that are greenish, tinged with blue and maroon.
Terrestrial Habitat(s): Barrens, Forest/Woodland, Woodland - Mixed
Habitat Comments: Shale barrens and adjacent woodlands. Usually found on southern exposures, particularly toward the bases of slopes.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 17Jun1999
NatureServe Conservation Status Factors Author: Ludwig, J.C. (1991); rev. Ludwig/Maybury (1996); rev. Ludwig (Sept/97); rev. L. Morse (1998, 1999).

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Keener, C.S. 1967. A biosystemic study of Clematis subsection Integrifoliae (Ranunculaceae). J. Elisha Mitchell Scientific Society 83(1): 19-38.

  • Kral, R. 1983c. A report on some rare, threatened, or endangered forest-related vascular plants of the South. U.S. Dept. of Agriculture Forest Service Technical Publication R8-TP2, Athens, GA. 1305 pp.

  • Southern Appalachian Species Viability Project. 2002. A partnership between the U.S. Forest Service-Region 8, Natural Heritage Programs in the Southeast, NatureServe, and independent scientists to develop and review data on 1300+ regionally and locally rare species in the Southern Appalachian and Alabama region. Database (Access 97) provided to the U.S. Forest Service by NatureServe, Durham, North Carolina.

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