Taxon Report
Cardamine pachystigma (Wats.) Roll. var. dissectifolia (Detl.) Roll.dissected-leaved toothwort |
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Taxon Summary
Cardamine pachystigma var. dissectifolia, commonly known as dissected-leaved toothwort, is a perennial rhizomatous herb in the Brassicaceae that is found only in California. It occurs within Chaparral, and Lower montane coniferous forest, growing at elevations from 255 to 2100 meters. Cardamine pachystigma var. dissectifolia is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Cardamine pachystigma (Wats.) Roll. var. dissectifolia (Detl.) Roll. |
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Common Name: |
dissected-leaved toothwort |
| Family: | Brassicaceae |
| Element Code: | PDBRA0K1B1 |
| USDA Plants Symbol: | CAPAD2 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial rhizomatous herb |
| Blooming Period: Feb-May | Feb-May |
| Elevation: | 255-2100 (835-6890) |
| General Habitats: | Chaparral, Lower montane coniferous forest |
| Microhabitat: | Rocky, Serpentine (usually) |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G3G5T2Q |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 19 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 3 |
| Fair (C) | 9 |
| Poor (D) | 2 |
| None (X) | 0 |
| Unknown (U) | 5 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Butte (BUT) | |
| Quads: Name (Quad Code) | |
| Berry Creek (3912164), Cherokee (3912165), Clipper Mills (3912152), Cohasset (3912186), Paradise East (3912175), Paradise West (3912176), Pulga (3912174), Stirling City (3912185) | |
Threat List Data from the CNDDB
| Threat List Total: | 4 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 5 | 26 % | |
| Road/trail construction/maint. | 4 | 21% |
| ORV activity | 2 | 10% |
| Biocides | 1 | 5% |
| Improper burning regime | 1 | 5% |
Notes
| Previously on List 3 due to lack of location, rarity, and endangerment information; location information still needed. Threatened by non-native plants, road and trail maintenance, vehicles, and alteration of fire regimes. Many collections lack tubers, which aid in identification. A synonym of C. californica in TJM 2. See American Journal of Botany 23:575 (1936) for original description, and Harvard Papers in Botany 4:43-48 (1993) for revised nomenclature. |
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Threats: |
| Threatened by non-native plants, road and trail maintenance, vehicles, and alteration of fire regimes. |
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Taxonomy: |
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Many collections lack tubers, which aid in identification. A synonym of C. californica |
Selected References
| Proposal to keep as CRPR 3, G3G5T3Q / S3 (2012) |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 19 November 2025].