Berberis nervosa - Pursh
Longleaf Oregon-grape
Other English Common Names: Cascade Barberry, Dwarf Oregon-grape
Other Common Names: Cascade barberry
Synonym(s): Mahonia nervosa (Pursh) Nutt.
Taxonomic Status: Accepted
Related ITIS Name(s): Mahonia nervosa (Pursh) Nutt. (TSN 195036)
French Common Names: mahonia nervures saillantes
Unique Identifier: ELEMENT_GLOBAL.2.161033
Element Code: PDBER06090
Informal Taxonomy: Plants, Vascular - Flowering Plants - Barberry Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Ranunculales Berberidaceae Berberis
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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: Mahonia nervosa
Taxonomic Comments: Varieties in Mahonia nervosa are not recognized by Kartesz (1999); in 1994, he had recognized vars. mendocinensis and nervosa. These plants have also been treated in the genus Berberis (FNA vol. 3, 1997).
Conservation Status
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NatureServe Status

Global Status: G5
Global Status Last Reviewed: 13Jul2015
Global Status Last Changed: 01Oct1987
Ranking Methodology Used: Ranked by inspection
Rounded Global Status: G5 - Secure
Reasons: Mahonia nervosa ranges from British Columbia south through California in coniferous forests typically only on the western side of the Cascades Range. It is relatively abundant throughout its range. This species is traded in the medicinal, herbal, and landscaping markets, but to a lesser degree than Mahonia aquifolium, because its roots are relatively smaller. However, it may be threatened by increased demand as it is considered to be interchangeable with Mahonia aquifolium by some sources familiar with the medicinal plants industry.
Nation: United States
National Status: NNR
Nation: Canada
National Status: N5 (08Mar2014)

U.S. & Canada State/Province Status
United States California (SNR), Idaho (SNR), Montana (SU), Oregon (SNR), Washington (SNR)
Canada British Columbia (S5)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: Mahonia nervosa ranges from British Columbia, Canada, and south through California, U.S.

Population Size Comments: Reportedly abundant throughout its range (Vance et al. in press). Common in northern California (CALFLORA).

Overall Threat Impact Comments: Mahonia species are reportedly used as a substitute for goldenseal (Tilford 1998). Some experts in the medicinal plant industry have suggested that trade is medium to large and demand has increased over the past ten years (Robbins 1999). Thus, although current demand is modest, increased interest is possible. Therefore, trends in commercial interest and collecting activities should be monitored even though it is relatively common in its native range. This species is traded in the medicinal, herbal, and landscaping markets, however it may be less viable for large-scale commercial harvest than Mahonia aquifolium because its roots are relatively smaller (Vance et al. in press). Disturbance reduces this species' ability to spread through rhizomes (Vance et al. in press). See Vance et al. (in press) for suggested guidelines for sustainable harvesting techniques.

Short-term Trend Comments: Apparently relatively stable; no population inventories reporting major decline; however some experts in the medicinal plant industry have suggested that population and species have declined over the past ten years (Robbins 1999).

Other NatureServe Conservation Status Information

Distribution
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Global Range: Mahonia nervosa ranges from British Columbia, Canada, and south through California, U.S.

U.S. States and Canadian Provinces
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States CA, ID, MT, OR, WA
Canada BC

Range Map
No map available.

Ecology & Life History
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Basic Description: Perennial evergreen ground cover plant with spreading rhizomes. Clustered flowers are yellow and produce edible purple fruits.
Ecology Comments: Berries and leaves are browsed by ungulates and rodents (Tilford1998). Also, provides significant forage for the white-footed vole in coastal Oregon (Vance et al. in press). This plant aerates and stabilizes soils.
Habitat Comments: An understory plant in western North American coniferous forests, typically growing only on the western side of the Cascades Range below 2200 m. Relatively shade tolerant and common in second-growth Douglas-fir forests (Vance et al in press).
Economic Attributes
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Economic Uses: MEDICINE/DRUG, LANDSCAPING
Production Method: Cultivated, Wild-harvested
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: 25Jan2001
NatureServe Conservation Status Factors Author: Kelly McConnell

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
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  • Flora of North America Editorial Committee. 1997. Flora of North America north of Mexico. Vol. 3. Magnoliophyta: Magnoliidae and Hamamelidae. Oxford Univ. Press, New York. xxiii + 590 pp.

  • 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.

  • Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.

  • Robbins, C. 1999. Medicine from US wildlands: An assessment of native plant species harvested in the United States for medicinal use and trade and evaluation of the conservation and management implications. Traffic North America. Prepared for The Nature Conservancy, Arlington, VA. Available at http://www.nps.gov/plants/medicinal/.

  • Tilford, G. L. 1998. From Earth to Herbalist. Mountain Press Publishing Company, Missoula, Montana.

  • Vance, N.C., M. Borsting and D. Pilz. In press. Special forest products species information guide for Pacific Northwest. USDA Forest Service, Pacific Northwest Research Station, General Technical Report PNW-GTR-XX.

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