Taxon Report
Streptanthus glandulosus Hook. ssp. niger (Greene) Al-Shehbaz et al.Tiburon jewelflower |
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Classification
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Scientific Name: |
Streptanthus glandulosus Hook. ssp. niger (Greene) Al-Shehbaz et al. |
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Common Name: |
Tiburon jewelflower |
| Family: | Brassicaceae |
| Element Code: | PDBRA2G0T0 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: May-Jun | May-Jun |
| Elevation: | 30-150 (100-490) |
| General Habitats: | Valley and foothill grassland |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G4T1 |
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State Rank: |
S1 |
| State List: | CE |
| Fed List: | FE |
| Other Status: | SB_CalBG/RSABG; SB_UCBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 2 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 2 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 0 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Marin (MRN) | |
| Quads: Name (Quad Code) | |
| San Quentin (3712284) | |
Threat List Data from the CNDDB
| Threat List Total: | 7 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 2 | 100 % | |
| Development | 2 | 100% |
| Erosion/runoff | 2 | 100% |
| Foot traffic/trampling | 2 | 100% |
| Non-native plant impacts | 2 | 100% |
| Other | 2 | 100% |
| Road/trail construction/maint. | 2 | 100% |
| Recreational use (non-ORV) | 1 | 50% |
Notes
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Known from only two occurrences on the Tiburon Peninsula. Threatened by road construction, trampling, foot traffic, non-native plants, and development. See Bulletin of the Torrey Botanical Club |
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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 9 January 2025].