Taxon Report
Cirsium arizonicum (A. Gray) Petrak var. tenuisectum Keildesert mountain thistle |
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Classification
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Scientific Name: |
Cirsium arizonicum (A. Gray) Petrak var. tenuisectum Keil |
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Common Name: |
desert mountain thistle |
| Family: | Asteraceae |
| Element Code: | PDAST2E083 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: Jun-Nov | Jun-Nov |
| Elevation: | 1500-2800 (4920-9185) |
| General Habitats: | Joshua tree "woodland", Mojavean desert scrub, Pinyon and juniper woodland |
| Microhabitat: | Disturbed areas, Roadsides (often), Rocky |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G5T2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 8 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 1 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 7 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| San Bernardino (SBD) | |
| Quads: Name (Quad Code) | |
| Clark Mtn. (3511555), Ivanpah (3511533), Pinto Valley (3511523) | |
Threat List Data from the CNDDB
| Threat List Total: | 2 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 2 | 25 % | |
| Other | 1 | 12% |
| Recreational use (non-ORV) | 1 | 12% |
Notes
| Known in CA only from the New York Mountains of San Bernardino County. The name Cirsium nidulum has long been misapplied to this species. May be distinctive enough to be its own taxon and not a variety of Cirsium arizonicum. See SIDA 21(1): 210 (2004) for original description. |
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Threats: |
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Taxonomy: |
Selected References
| CRPR List Addition on 2006-12-27 |
Citation
California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 25 December 2024].