Taxon Details
Cirsium occidentale var. compactum
compact cobwebby thistle
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Taxon Summary:
Cirsium occidentale var. compactum, commonly known as compact cobwebby thistle, is a perennial herb in the Asteraceae that is found only in California. It occurs within Chaparral, Coastal dunes, Coastal prairie, and Coastal scrub, growing at elevations from 5 to 150 meters. Cirsium occidentale var. compactum is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.|
Scientific Name: Cirsium occidentale (Nutt.) Jeps. var. compactum Hoov. |
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Common Name: compact cobwebby thistle |
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| Family: | Asteraceae | |
| Element Code: | PDAST2E1Z1 | |
| USDA Plants Symbol: | CIOCC2 | |
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Synonyms/Other Names: |
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| Name Status: |
JEF, FNA, POWO, IPNI, Tropicos |
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| CA Rare Plant Rank: | 1B.2 |
| Fed List: | None |
| State List: | None |
| Global Rank: | G3G4T2 |
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State Rank: |
S2 |
| Other Status: | BLM_S |
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CRPR Changes: |
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| Add Date: | 1974-01-01 |
| Date Edited: | 2021-05-26 |
| Lifeform: perennial herb | ||||||||||||||
Blooming Period: Apr-Jun
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Elevation:
5 - 150 meters 15 - 490 feet |
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General Habitats:
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| Microhabitat Details: | ||||||||||||||
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Microhabitat:
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Notes: Known from fewer than twenty occurrences. Threatened by grazing and insect predation, and potentially by road construction and development. Some inland plants weakly separated from var. occidentale. Compact, low-growing plants from MNT Co. (344C) are probably not var. compactum. |
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Threats: |
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Taxonomy: |
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| Threat List Total: | 5 | |
| Total EOs | % of EOs | |
| EOs with Threat Listed: | 9 | 30 % |
| THREAT LIST: | ||
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| Road/trail construction/maint. | 5 | 16% |
| Grazing | 4 | 13% |
| Non-native plant impacts | 3 | 10% |
| Erosion/runoff | 2 | 6% |
| Development | 1 | 3% |
| Total Occurrences: | 30 | ||||
| Element Occurrence Ranks: | |||||
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| A | B | C | D | X | U |
| 1 | 3 | 3 | 1 | 1 | 21 |
| Occurrence Status: | |||||
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| Historical >20 Years | 24 | ||||
| Recent <=20 Years | 6 | ||||
| Presence: | |||||
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| Presumed Extant | 29 | ||||
| Possibly Extirpated | 1 | ||||
| Presumed Extirpated | 0 | ||||
| California Endemic: | |||||||||||||
| California Island: | |||||||||||||
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States: Name (Code) California (CA) |
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California Counties and Islands: Name (Code) Los Angeles (LAX), Monterey (MNT)?, San Francisco (SFO)*, San Luis Obispo (SLO), San Mateo (SMT), Santa Barbara (SBA) |
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Quads: Name (Quad Code) Big Sur (3612137), Cambria (3512151), Cayucos (3512048), Pfeiffer Point (3612127), Pico Creek (3512152), Piedras Blancas (3512163), Point Sal (3412086), Point Sur (3612138)?, San Francisco South (3712264)*, San Miguel Island East (3312083), San Miguel Island West (3312084), San Simeon (3512162), Santa Catalina East (3311833), Santa Rosa Island North (3312081), Santa Rosa Island South (3312071), Santa Rosa Island West (3312082) |
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Notes:
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Presumed Extant
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