Roadless Areas
Home/Species/ Barton Flats Horkelia

Horkelia wilderae

Parish

Barton Flats Horkelia

G1Critically Imperiled Found in 3 roadless areas NatureServe Explorer →
G1Critically ImperiledGlobal Rank
HighThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.147700
Element CodePDROS0W0J0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderRosales
FamilyRosaceae
GenusHorkelia
Other Common Names
Barton Flats Honeydew (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 Date2016-12-27
Change Date2016-12-27
Edition Date2016-12-27
Edition AuthorsD. Gries, rev. R. Bittman 2005, rev. R. Bittman (2016)
Threat ImpactHigh
Range Extent<100 square km (less than about 40 square miles)
Number of Occurrences6 - 20
Rank Reasons
Endemic to the Barton Flats area in San Bernardino County, California, Horkelia wilderae is known from 8 occurrences, 2 of which are historic and need rechecking. Threats include development, roads, trampling, and recreation Threats include logging and recreational activities.
Range Extent Comments
The range includes only a small portion of San Bernardino County, California near Barton Flats.
Occurrences Comments
8 total occurrences are known, but 2 are historic and need rechecking (CNDDB 2016).
Threat Impact Comments
Threats include development, roads, trampling, and recreation (CNDDB 2016).
Ecology & Habitat

Habitat

Dry benches, at edge between Chaparral and Yellow Pine Forest communities. 1675 - 3000 m.
Terrestrial Habitats
Forest/WoodlandForest - ConiferForest EdgeShrubland/chaparral
Other Nations (1)
United StatesN1
ProvinceRankNative
CaliforniaS1Yes
Threat Assessments
ThreatScopeSeverityTiming
1 - Residential & commercial development———
1.1 - Housing & urban areas———
4 - Transportation & service corridors———
4.1 - Roads & railroads———
6 - Human intrusions & disturbance———
6.1 - Recreational activities———

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Plant Characteristics
Economic Value (Genus)No
Roadless Areas (3)
California (3)
AreaForestAcres
Crystal CreekSan Bernardino National Forest6,783
Raywood Flat BSan Bernardino National Forest11,373
SugarloafSan Bernardino National Forest8,206
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. California Natural Diversity Database (CNDDB). 2016. RareFind Version 5.1.1. California Department of Fish and Game, Sacramento.
  4. 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.
  5. Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.
  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. Munz, P.A., with D.D. Keck. 1959. A California flora. Univ. California Press, Berkeley. 1681 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.