Taxon Report
Boechera constancei (Rollins) Al-ShehbazConstance's rockcress |
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Taxon Summary
Boechera constancei, commonly known as Constance's rockcress, is a perennial herb in the Brassicaceae that is found only in California. It occurs within Chaparral, Lower montane coniferous forest, and Upper montane coniferous forest, growing at elevations from 975 to 2025 meters. Boechera constancei is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Boechera constancei (Rollins) Al-Shehbaz |
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Common Name: |
Constance's rockcress |
| Family: | Brassicaceae |
| Element Code: | PDBRA06090 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: May-Jul | May-Jul |
| Elevation: | 975-2025 (3200-6645) |
| General Habitats: | Chaparral, Lower montane coniferous forest, Upper montane coniferous forest |
| Microhabitat: | Rocky, Serpentine |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 59 |
| Element Occurrence Ranks: | |
| Excellent (A) | 4 |
| Good (B) | 20 |
| Fair (C) | 3 |
| Poor (D) | 1 |
| None (X) | 0 |
| Unknown (U) | 31 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Plumas (PLU), Sierra (SIE) | |
| Quads: Name (Quad Code) | |
| Belden (4012113), Bucks Lake (3912182), Canyondam (4012121), Caribou (4012112), Crescent Mills (4012018), Greenville (4012028), La Porte (3912068), Meadow Valley (3912181), Onion Valley (3912078), Quincy (3912088), Spring Garden (3912087), Twain (4012111) | |
Threat List Data from the CNDDB
| Threat List Total: | 10 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 40 | 68 % | |
| Logging | 29 | 49% |
| Road/trail construction/maint. | 12 | 20% |
| Mining | 7 | 11% |
| Other | 5 | 8% |
| Wood cutting or brush clearing | 3 | 5% |
| ORV activity | 3 | 5% |
| Improper burning regime | 2 | 3% |
| Biocides | 1 | 1% |
| Disease | 1 | 1% |
| Erosion/runoff | 1 | 1% |
Selected References
| Boechera constancei account for potential Species of Conservation Concern evaluation (2023) |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 17 November 2025].