Taxon Report
Cirsium crassicaule (Greene) Jeps.slough thistle |
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Taxon Summary
Cirsium crassicaule, commonly known as slough thistle, is a annual/perennial herb in the Asteraceae that is found only in California. It occurs within Chenopod scrub, Marshes and swamps (sloughs), and Riparian scrub, growing at elevations from 3 to 100 meters. Cirsium crassicaule is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Cirsium crassicaule (Greene) Jeps. |
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Common Name: |
slough thistle |
| Family: | Asteraceae |
| Element Code: | PDAST2E0U0 |
| USDA Plants Symbol: | CICR |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual/perennial herb |
| Blooming Period: May-Aug | May-Aug |
| Elevation: | 3-100 (10-330) |
| General Habitats: | Chenopod scrub, Marshes and swamps, Riparian scrub |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| 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: | 18 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 6 |
| Fair (C) | 1 |
| Poor (D) | 0 |
| None (X) | 2 |
| Unknown (U) | 9 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Kern (KRN), Kings (KNG), San Joaquin (SJQ) | |
| Quads: Name (Quad Code) | |
| Hacienda Ranch (3511975)?*, Lathrop (3712173), Lone Tree Well (3511976), Lost Hills NE (3511965), Lost Hills NW (3511966), Semitropic (3511955), Tupman (3511933), Vernalis (3712163), Wasco SW (3511954) | |
Threat List Data from the CNDDB
| Threat List Total: | 11 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 13 | 72 % | |
| Agriculture | 7 | 38% |
| Grazing | 3 | 16% |
| Altered flood/tidal/hydrologic regime | 2 | 11% |
| Biocides | 1 | 5% |
| Dam/Inundation | 1 | 5% |
| Development | 1 | 5% |
| Improper burning regime | 1 | 5% |
| Non-native plant impacts | 1 | 5% |
| Road/trail construction/maint. | 1 | 5% |
| Surface water diversion | 1 | 5% |
| Waterway bank protection/maintenance | 1 | 5% |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 20 November 2025].