Roadless Areas
Home/Species/ Castle Crags Ivesia

Ivesia longibracteata

Ertter

Castle Crags Ivesia

G1Critically Imperiled Found in 4 roadless areas NatureServe Explorer →
G1Critically ImperiledGlobal Rank
MediumThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.142904
Element CodePDROS0X0U0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderRosales
FamilyRosaceae
GenusIvesia
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 Date2020-11-06
Change Date1986-10-22
Edition Date2020-11-06
Edition AuthorsGries, D. (1997); R. Bittman (2010), rev. Treher (2020)
Threat ImpactMedium
Range Extent<100 square km (less than about 40 square miles)
Number of Occurrences1 - 5
Rank Reasons
Ivesia longibracteata is endemic to northern California, U.S.A., in Shasta County. This perennial herb is known only from the Castle Crags area, at 1200-1400 meters elevation, in the eastern Klamath Ranges floristic subregion. There is only one known occurrence and it occurs on public lands owned by the USFS on the Shasta-Trinity National Forest. The threats include recreation and climate change, otherwise the site is protected due to its remote location.
Range Extent Comments
Ivesia longibracteata endemic to California, U.S.A., in the Castle Crags area in the eastern Klamath Ranges floristic subregion (Jepson Flora Project 2021). Range Extent is very small as there is only one small occurrence.
Threat Impact Comments
Threats are minimal to this site. The only disturbance to the site would be from climbers and hikers. Since this is the only known occurrence at a relatively high elevation, it is possible that climate change may negatively affect it.
Ecology & Habitat

Habitat

This species occurs in rock crevices in granitic cliffs within montane coniferous forest community with a surrounding overstory that includes Pinus ponderosa, Pinus lambertiana, Pseudotsuga menziesii, Quercus chrysolepis, Lithocarpus densiflorus, and Arctostaphylos patula. It is associated with Campanula shetleri. It grows at elevations of 1,200 to 1,400 meters (CNDDB 2021, Jepson Flora Project 2021, FNA 2014).
Terrestrial Habitats
Forest/WoodlandForest - ConiferBare rock/talus/screeCliff
Other Nations (1)
United StatesN1
ProvinceRankNative
CaliforniaS1Yes
Threat Assessments
ThreatScopeSeverityTiming
6 - Human intrusions & disturbancePervasive (71-100%)Moderate or 11-30% pop. declineHigh (continuing)
6.1 - Recreational activitiesPervasive (71-100%)Moderate or 11-30% pop. declineHigh (continuing)
11 - Climate change & severe weatherPervasive (71-100%)UnknownHigh (continuing)
11.1 - Habitat shifting & alterationPervasive (71-100%)UnknownHigh (continuing)

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Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (4)
California (4)
AreaForestAcres
Castle Crags AShasta-Trinity National Forest113
Castle Crags BShasta-Trinity National Forest1,619
East GirardShasta-Trinity National Forest27,894
West GirardShasta-Trinity National Forest37,516
References (8)
  1. CalFlora. 2005. Information on California plants for education, research and conservation. Berkeley, California: The CalFlora Database [web application]. Available: http://www.calflora.org/. (Accessed 2005)
  2. California Native Plant Society (CNPS). 2001. Inventory of Rare and Endangered Plants of California (sixth edition). Rare Plant Scientific Advisory Committee, David P. Tibor, Convening Editor. California Native Plant Society. Sacramento, CA. x + 388pp.
  3. Flora of North America Editorial Committee (FNA). 2014b. Flora of North America north of Mexico. Vol. 9. Magnoliophyta: Picramniaceae to Rosaceae. Oxford University Press, New York. xxiv + 713 pp.
  4. Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.
  5. Jepson Flora Project (eds.) 2021. Jepson eFlora. Online. Available: https://ucjeps.berkeley.edu/eflora/ (accessed 2021).
  6. 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.
  7. Nakamura, G., and J. K. Nelson, eds. 2001. Illustrated field guide to selected rare plants of northern California. University of California Agriculture and Natural Resources publication 3395, Oakland, CA. 370 pp.
  8. Skinner, M.W., and B.M. Pavlik, eds. 1997 (1994). Inventory of rare and endangered vascular plants of California. 1997 Electronic Inventory Update of 1994 5th edition, California Native Plant Society, Special Publication No. 1, Sacramento.