Taxon Report
Thelypodium stenopetalum Wats.slender-petaled thelypodium |
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Taxon Summary
Thelypodium stenopetalum, commonly known as slender-petaled thelypodium, is a perennial herb in the Brassicaceae that is found only in California. It occurs within Meadows and seeps (mesic, and alkaline), growing at elevations from 1600 to 2500 meters. Thelypodium stenopetalum is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Thelypodium stenopetalum Wats. |
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Common Name: |
slender-petaled thelypodium |
| Family: | Brassicaceae |
| Element Code: | PDBRA2N0F0 |
| USDA Plants Symbol: | THST |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: May-Sep | May-Sep |
| Elevation: | 1600-2500 (5250-8205) |
| General Habitats: | Meadows and seeps |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | CE |
| Fed List: | FE |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 11 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 4 |
| Fair (C) | 1 |
| Poor (D) | 1 |
| None (X) | 4 |
| Unknown (U) | 1 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| San Bernardino (SBD) | |
| Quads: Name (Quad Code) | |
| Big Bear City (3411637), Big Bear Lake (3411628), Fawnskin (3411638), Moonridge (3411627) | |
Threat List Data from the CNDDB
| Threat List Total: | 14 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 11 | 100 % | |
| Development | 9 | 81% |
| Altered flood/tidal/hydrologic regime | 8 | 72% |
| ORV activity | 6 | 54% |
| Grazing | 5 | 45% |
| Non-native plant impacts | 5 | 45% |
| Wood cutting or brush clearing | 5 | 45% |
| Foot traffic/trampling | 4 | 36% |
| Other | 3 | 27% |
| Recreational use (non-ORV) | 2 | 18% |
| Road/trail construction/maint. | 2 | 18% |
| Vandalism/dumping/litter | 1 | 9% |
| Erosion/runoff | 1 | 9% |
| Mining | 1 | 9% |
| Non-native animal impacts | 1 | 9% |
Notes
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Known from approximately ten occurrences. Seriously threatened by foot traffic, grazing, hydrological alterations, mining, vehicles, and urbanization. Protected in part at Baldwin Lake ER (DFG). See Proceedings of the American Academy of Arts and Sciences |
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Threats: |
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Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 14 March 2025].