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Ageratina shastensis

(Taylor & Stebbins) King & H.E. Robins.

Mt. Shasta Snakeroot

G3Vulnerable Found in 3 roadless areas NatureServe Explorer →
G3VulnerableGlobal Rank
MediumThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.144256
Element CodePDASTBX0R0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderAsterales
FamilyAsteraceae
GenusAgeratina
Synonyms
Eupatorium shastenseTaylor & Stebbins
Other Common Names
Shasta Eupatorium (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 MethodLegacy Rank calculation - Excel v3.1x
Review Date2017-04-03
Change Date2017-04-03
Edition Date2017-04-03
Edition AuthorsGravuer, K., rev. R. Bittman (2017)
Threat ImpactMedium
Range Extent250-1000 square km (about 100-400 square miles)
Number of Occurrences21 - 80
Rank Reasons
This species is known only from a small area within the Cascade Range in Shasta County, California. 22 occurrences are believed extant, with an additional 5 considered historical or unrankable. Almost all occurrences are within the Shasta-Trinity National Forest, where it is considered a Sensitive Species. Potential threats include mining, logging, and road building/expansion, and recreation.
Range Extent Comments
Endemic to Shasta County, California, in the Cascade Range.
Occurrences Comments
There are 27 occurrences in the CNDDB (2017).
Threat Impact Comments
Threats include mining, logging, roads, and recreation (CNDDB 2017).
Ecology & Habitat

Diagnostic Characteristics

Recognized by relatively large solitary heads and coarsely serrate, subcoriaceous leaves alternate on distal parts of stems (Flora of North America Editorial Committee 2006).

Habitat

Cracks and crevices of limestone cliffs and outcrops, within chaparral and lower montane coniferous forest (yellow pine) communities. 400-1800 m.
Terrestrial Habitats
Forest/WoodlandForest - ConiferShrubland/chaparralBare rock/talus/screeCliff
Other Nations (1)
United StatesN3
ProvinceRankNative
CaliforniaS3Yes
Threat Assessments
ThreatScopeSeverityTiming
3 - Energy production & mining———
3.2 - Mining & quarrying———
4 - Transportation & service corridors———
4.1 - Roads & railroads———
5 - Biological resource use———
5.3 - Logging & wood harvesting———
6 - Human intrusions & disturbance———
6.1 - Recreational activities———

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Plant Characteristics
Economic Value (Genus)No
Roadless Areas (3)
California (3)
AreaForestAcres
East GirardShasta-Trinity National Forest27,894
Kettle Mtn.Shasta-Trinity National Forest4,589
West GirardShasta-Trinity National Forest37,516
References (6)
  1. California Native Plant Society (CNPS). 2009. Inventory of Rare and Endangered Plants. California Native Plant Society. Sacramento, CA. Online. Available: http://www.cnps.org/inventory (accessed 2009).
  2. California Natural Diversity Database (CNDDB). 2017. RareFind Version  5.2.14. California Department of Fish and Game, Sacramento.
  3. 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.
  4. Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.
  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. Munz, P.A., with D.D. Keck. 1959. A California flora. Univ. California Press, Berkeley. 1681 pp.