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Home/Species/ Mt. Shasta Arnica

Arnica viscosa

A. Gray

Mt. Shasta Arnica

G4Apparently Secure Found in 5 roadless areas NatureServe Explorer →
G4Apparently SecureGlobal Rank
LowThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.141187
Element CodePDAST0Q0R0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single nation
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusArnica
Other Common Names
Mt. Shasta arnica (EN)
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.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2023-08-11
Change Date1988-05-05
Edition Date2023-08-11
Edition AuthorsRoth, E. (1987), rev. C. Nordman (2023).
Threat ImpactLow
Range Extent20,000-200,000 square km (about 8000-80,000 square miles)
Number of Occurrences21 - 80
Rank Reasons
Mt. Shasta Arnica occurs in the northwestern United States, in the Cascade Range and Klamath Range of northern California and western Oregon, in rocky alpine and subalpine habitat. There are about 36 occurrences, including protected within five Wilderness Areas on National Forests, and at Crater Lake National Park. It occurs in remote areas, threats are thought to be low, it may be threatened by recreational development, such as for skiing.
Range Extent Comments
Mt. Shasta Arnica occurs in the northwestern United States, in the Cascade Range and Klamath Range of northern California and western Oregon. It has an intermittent range, occurring in rocky alpine and subalpine habitat north from the Mt. Shasta area (in Shasta, Siskiyou and Trinity counties) of California to the southern Oregon Cascades (occuring in Deschutes, Douglas, Klamath counties). The range extent was estimated to be 27,000 square kilometers, using herbarium specimens, photo-based observations, and NatureServe Network occurrence data collected between 1992 and 2023 (CCH2 Portal 2023, Flora of North America Editorial Committee 2006, GBIF 2023, iNaturalist 2023, NatureServe 2023).
Occurrences Comments
By applying a 1 km separation distance to herbarium specimens, photo-based observations, and NatureServe Network occurrence data documented between 1992 and 2023, it is estimated that there are about 36 occurrences rangewide (CCH2 Portal 2023, GBIF 2023, iNaturalist 2023, NatureServe 2023).
Threat Impact Comments
Mt. Shasta Arnica may be threatened by recreational development, such as for skiing. The habitat is fairly remote, and some of the sites are apparently rarely visited. Mining could be a threat in the future.
Ecology & Habitat

Habitat

Scree, talus gullies, igneous or volcanic talus (including dacite, gabbro, granite, and metasedimentary rock), and slopes with seasonal water runoff, above and at the limit of tree growth, including in open subalpine red fir or white fir, occurs at elevations of 1700-2500m (CCH2 Portal 2023, Flora of North America Editorial Committee 2006, NatureServe 2023).

Reproduction

Flowering in August and September (Flora of North America Editorial Committee 2006).
Terrestrial Habitats
Woodland - ConiferAlpineBare rock/talus/scree
Other Nations (1)
United StatesN4
ProvinceRankNative
CaliforniaS3Yes
OregonS2Yes
Threat Assessments
ThreatScopeSeverityTiming
1 - Residential & commercial developmentSmall (1-10%)Serious or 31-70% pop. declineHigh (continuing)
1.3 - Tourism & recreation areasSmall (1-10%)Serious or 31-70% pop. declineHigh (continuing)

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Plant Characteristics
DurationBIENNIAL
Economic Value (Genus)No
Roadless Areas (5)
California (3)
AreaForestAcres
Box CampKlamath National Forest858
Mt. Shasta AShasta-Trinity National Forest676
Mt. Shasta BShasta-Trinity National Forest2,809
Oregon (2)
AreaForestAcres
Sky Lakes AWinema National Forest3,940
Sky Lakes BWinema National Forest9,615
References (6)
  1. CCH2 Portal. 2023. Consortium of California Herbaria. Online. Available: https//:www.cch2.org/portal/index.php (accessed 2023).
  2. Flora of North America Editorial Committee (FNA). 2006c. Flora of North America north of Mexico. Vol. 21. Magnoliophyta: Asteridae, part 8: Asteraceae, part 3. Oxford Univ. Press, New York. xxii + 616 pp.
  3. Global Biodiversity Information Facility (GBIF). 2023. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2023).
  4. iNaturalist. 2023. Online. Available: https://www.inaturalist.org (accessed 2023).
  5. 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.
  6. NatureServe. 2023. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.