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Home/Species/ Slender-petal Thelypody

Thelypodium stenopetalum

S. Wats.

Slender-petal Thelypody

G1Critically Imperiled Found in 1 roadless area NatureServe Explorer →
G1Critically ImperiledGlobal Rank
Very high - highThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.130408
Element CodePDBRA2N0F0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderCapparales
FamilyBrassicaceae
GenusThelypodium
Other Common Names
Slender-petaled mustard (EN) slenderpetal thelypody (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
Review Date2015-10-14
Change Date1983-11-10
Edition Date2005-09-28
Edition AuthorsD. Gries, rev. R. Bittman (7/98), R. Bittman 2005
Threat ImpactVery high - high
Range Extent100-250 square km (about 40-100 square miles)
Number of Occurrences6 - 20
Rank Reasons
Endemic to California, Thelypodium stenopetalum is known from 10 total, and perhaps as few as 3 or 4 extant, occurrences in the meadows of Big Bear Basin in San Bernardino County. It is protected in part at Baldwin Lake Ecological Reserve. Seriously threatened by urbanization, ORVs, weeds, grazing and burros. Ownership is a mix of USFS, DFG, Private and City lands.
Range Extent Comments
California endemic, restricted to meadows of Big Bear Basin in San Bernardino County (Skinner, 1997). The full range extent covers no more than 49 sq mi.
Occurrences Comments
Known from three recent and seven historical occurrences (Bittman 1998).
Threat Impact Comments
Seriously threatened by development, vehicles, weeds, burros and grazing. ORV use and development are the most serious threats.
Ecology & Habitat

Habitat

Mesic, alkaline meadows (Skinner, 1997).
Terrestrial Habitats
Grassland/herbaceous
Other Nations (1)
United StatesN1
ProvinceRankNative
CaliforniaS1Yes
Threat Assessments
ThreatScopeSeverityTiming
1 - Residential & commercial developmentPervasive (71-100%)Extreme or 71-100% pop. declineHigh - moderate
1.1 - Housing & urban areasPervasive (71-100%)Extreme or 71-100% pop. declineHigh - moderate
2 - Agriculture & aquaculturePervasive - largeExtreme - seriousHigh (continuing)
2.3 - Livestock farming & ranchingPervasive - largeExtreme - seriousHigh (continuing)
6 - Human intrusions & disturbancePervasive (71-100%)Extreme or 71-100% pop. declineHigh (continuing)
6.1 - Recreational activitiesPervasive (71-100%)Extreme or 71-100% pop. declineHigh (continuing)
8 - Invasive & other problematic species, genes & diseasesPervasive - largeExtreme - seriousHigh (continuing)
8.1 - Invasive non-native/alien species/diseasesPervasive - largeExtreme - seriousHigh (continuing)

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Plant Characteristics
Economic Value (Genus)No
Roadless Areas (1)
California (1)
AreaForestAcres
SugarloafSan Bernardino National Forest8,206
References (4)
  1. Bittman, R. 1998. Lead Botanist, California Natural Diversity Database. Unpublished notes on fifty rare plants of California for purposes of updating Element Global Ranking (EGR) forms. California Natural Heritage Division, Dep. of Fish & Game, Sacramento, California, U.S.A.
  2. Flora of North America Editorial Committee (FNA). 2010. Flora of North America north of Mexico. Vol. 7. Magnoliophyta: Salicaceae to Brassicaceae. Oxford University Press, New York. xxii + 797 pp.
  3. 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.
  4. 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.