Taxon Report
Cirsium scariosum Nutt. var. loncholepis (Petr.) D.J. KeilLa Graciosa thistle |
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Classification
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Scientific Name: |
Cirsium scariosum Nutt. var. loncholepis (Petr.) D.J. Keil |
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Common Name: |
La Graciosa thistle |
| Family: | Asteraceae |
| Element Code: | PDAST2E1N0 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: May-Aug | May-Aug |
| Elevation: | 4-220 (15-720) |
| General Habitats: | Cismontane woodland, Coastal dunes, Coastal scrub, Marshes and swamps, Valley and foothill grassland |
| Microhabitat: | Mesic, Sandy |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G5T1 |
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State Rank: |
S1 |
| State List: | CT |
| Fed List: | FE |
| Other Status: | SB_CalBG/RSABG; SB_SBBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 23 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 3 |
| Fair (C) | 3 |
| Poor (D) | 1 |
| None (X) | 14 |
| Unknown (U) | 2 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| San Luis Obispo (SLO), Santa Barbara (SBA) | |
| Quads: Name (Quad Code) | |
| Guadalupe (3412085), Los Alamos (3412063), Oceano (3512015), Orcutt (3412074)*, Point Sal (3412086), Sisquoc (3412073), Surf (3412065)* | |
Threat List Data from the CNDDB
| Threat List Total: | 14 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 21 | 91 % | |
| Other | 14 | 60% |
| Altered flood/tidal/hydrologic regime | 8 | 34% |
| Non-native plant impacts | 7 | 30% |
| Feral pigs | 6 | 26% |
| Grazing | 6 | 26% |
| ORV activity | 5 | 21% |
| Agriculture | 4 | 17% |
| Development | 4 | 17% |
| Foot traffic/trampling | 3 | 13% |
| Mining | 3 | 13% |
| Road/trail construction/maint. | 3 | 13% |
| Biocides | 2 | 8% |
| Improper burning regime | 1 | 4% |
| Recreational use (non-ORV) | 1 | 4% |
Selected References
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Beihefte zum Botanischen Centralblatt. Zweite Abteilung, Systematik, Pflanzengeographie, angewandte Botanik 35(2[2/3]): 375–378. 1917. (Beih. Bot. Centralbl., Abt. 2) |
| La Graciosa Thistle (Cirsium scariosum var. loncholepis) Recovery Plan (USFWS 2021) |
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Status of Endangered La Graciosa Thistle Cirsium scariosum var. loncholepis (Asteraceae) in Coastal Southern California |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 9 January 2025].