Taxon Report
Packera eurycephala (Torr. & A. Gray) W.A. Weber & A. Love var. lewisrosei (J.T. Howell) J.F. BainLewis Rose's ragwort |
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Taxon Summary
Packera eurycephala var. lewisrosei, commonly known as Lewis Rose's ragwort, is a perennial herb in the Asteraceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Lower montane coniferous forest, growing at elevations from 274 to 1890 meters. Packera eurycephala var. lewisrosei is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Packera eurycephala (Torr. & A. Gray) W.A. Weber & A. Love var. lewisrosei (J.T. Howell) J.F. Bain |
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Common Name: |
Lewis Rose's ragwort |
| Family: | Asteraceae |
| Element Code: | PDAST8H182 |
| USDA Plants Symbol: | PAEUL |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: Mar-Jul(Aug-Sep) | Mar-Jul(Aug-Sep) |
| Elevation: | 274-1890 (900-6200) |
| General Habitats: | Chaparral, Cismontane woodland, Lower montane coniferous forest |
| Microhabitat: | Serpentine |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G4T2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_UCSC; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 39 |
| Element Occurrence Ranks: | |
| Excellent (A) | 3 |
| Good (B) | 19 |
| Fair (C) | 2 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 15 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Butte (BUT), Plumas (PLU) | |
| Quads: Name (Quad Code) | |
| Belden (4012113), Berry Creek (3912164), Caribou (4012112), Cherokee (3912165), Jonesville (4012114), Paradise East (3912175), Pulga (3912174) | |
Threat List Data from the CNDDB
| Threat List Total: | 12 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 23 | 59 % | |
| Road/trail construction/maint. | 17 | 43% |
| Logging | 11 | 28% |
| ORV activity | 6 | 15% |
| Other | 6 | 15% |
| Mining | 4 | 10% |
| Recreational use (non-ORV) | 3 | 7% |
| Vandalism/dumping/litter | 2 | 5% |
| Non-native plant impacts | 2 | 5% |
| Erosion/runoff | 2 | 5% |
| Grazing | 1 | 2% |
| Improper burning regime | 1 | 2% |
| Disking | 1 | 2% |
Notes
| Threatened by mining, road maintenance, and vehicles. Taxonomic study needed. See Senecio eurycephalus var. lewisrosei in The Jepson Manual (1993). See Leaflets of Western Botany 3(6):141-142 (1942) for original description. See Phytologia 49(1): 44-50 (1981) for revised nomenclature. |
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Threats: |
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Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 October 2025].