Taxon Report
Sibaropsis hammittii S. Boyd & T.S. RossHammitt's clay-cress |
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Taxon Summary
Sibaropsis hammittii, commonly known as Hammitt's clay-cress, is a annual herb in the Brassicaceae that is found only in California. It occurs within Chaparral (openings), and Valley and foothill grassland, growing at elevations from 720 to 1065 meters. Sibaropsis hammittii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Sibaropsis hammittii S. Boyd & T.S. Ross |
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Common Name: |
Hammitt's clay-cress |
| Family: | Brassicaceae |
| Element Code: | PDBRA32010 |
| USDA Plants Symbol: | SIHA8 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Mar-Apr | Mar-Apr |
| Elevation: | 720-1065 (2360-3495) |
| General Habitats: | Chaparral, Valley and foothill grassland |
| Microhabitat: | Clay |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_CalBG/RSABG; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 7 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 2 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 5 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Riverside (RIV), San Diego (SDG) | |
| Quads: Name (Quad Code) | |
| Viejas Mountain (3211676), Wildomar (3311753) | |
Threat List Data from the CNDDB
| Threat List Total: | 1 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 1 | 14 % | |
| Foot traffic/trampling | 1 | 14% |
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 November 2025].