Taxon Report
Packera layneae (Greene) W.A. Weber & A. LoveLayne's ragwort |
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Classification
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Scientific Name: |
Packera layneae (Greene) W.A. Weber & A. Love |
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Common Name: |
Layne's ragwort |
| Family: | Asteraceae |
| Element Code: | PDAST8H1V0 |
| USDA Plants Symbol: | PALA41 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: Apr-Aug | Apr-Aug |
| Elevation: | 200-1085 (655-3560) |
| General Habitats: | Chaparral, Cismontane woodland |
| Microhabitat: | Gabbroic (sometimes), Rocky, Serpentine (sometimes) |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G2 |
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State Rank: |
S2 |
| State List: | CR |
| Fed List: | FT |
| Other Status: | SB_CalBG/RSABG; SB_UCBG; SB_UCSC |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 48 |
| Element Occurrence Ranks: | |
| Excellent (A) | 2 |
| Good (B) | 19 |
| Fair (C) | 6 |
| Poor (D) | 4 |
| None (X) | 2 |
| Unknown (U) | 15 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| El Dorado (ELD), Placer (PLA), Tuolumne (TUO), Yuba (YUB) | |
| Quads: Name (Quad Code) | |
| Chinese Camp (3712074), Clarksville (3812161), Coloma (3812078), Dutch Flat (3912027), Foresthill (3912017), Garden Valley (3812077), Georgetown (3812087), Moccasin (3712073), Pilot Hill (3812171), Placerville (3812067), Rackerby (3912143), Shingle Springs (3812068) | |
Threat List Data from the CNDDB
| Threat List Total: | 18 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 32 | 67 % | |
| Development | 16 | 33% |
| Road/trail construction/maint. | 14 | 29% |
| ORV activity | 6 | 12% |
| Other | 6 | 12% |
| Mining | 4 | 8% |
| Recreational use (non-ORV) | 4 | 8% |
| Erosion/runoff | 4 | 8% |
| Grazing | 3 | 6% |
| Vandalism/dumping/litter | 3 | 6% |
| Non-native plant impacts | 3 | 6% |
| Logging | 2 | 4% |
| Biocides | 2 | 4% |
| Dam/Inundation | 1 | 2% |
| Disking | 1 | 2% |
| Agriculture | 1 | 2% |
| Landfill | 1 | 2% |
| Pollution | 1 | 2% |
| Wood cutting or brush clearing | 1 | 2% |
Notes
| Threatened by urbanization, development, clearing, grazing, road construction, vehicles, non-native plants, and fire suppression. See Senecio layneae in TJM (1993). See Bulletin of the Torrey Botanical Club 10:87 (1883) 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 9 January 2025].