Taxon Report
Pentachaeta lyonii GrayLyon's pentachaeta |
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Taxon Summary
Pentachaeta lyonii, commonly known as Lyon's pentachaeta, is a annual herb in the Asteraceae that is found only in California. It occurs within Chaparral (openings), Coastal scrub, and Valley and foothill grassland, growing at elevations from 30 to 690 meters. Pentachaeta lyonii is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Pentachaeta lyonii Gray |
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Common Name: |
Lyon's pentachaeta |
| Family: | Asteraceae |
| Element Code: | PDAST6X060 |
| USDA Plants Symbol: | PELY4 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: (Feb)Mar-Aug | (Feb)Mar-Aug |
| Elevation: | 30-690 (100-2265) |
| General Habitats: | Chaparral, Coastal scrub, Valley and foothill grassland |
| Microhabitat: | Clay, Rocky |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | CE |
| Fed List: | FE |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 45 |
| Element Occurrence Ranks: | |
| Excellent (A) | 3 |
| Good (B) | 19 |
| Fair (C) | 10 |
| Poor (D) | 3 |
| None (X) | 6 |
| Unknown (U) | 4 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Los Angeles (LAX), Ventura (VEN) | |
| Quads: Name (Quad Code) | |
| Long Beach (3311872)*, Malibu Beach (3411816), Newbury Park (3411828), Point Dume (3411817), San Pedro (3311863)*, Santa Catalina North (3311844)?*, Simi (3411837), Thousand Oaks (3411827), Torrance (3311873) | |
Threat List Data from the CNDDB
| Threat List Total: | 14 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 38 | 84 % | |
| Development | 25 | 55% |
| Non-native plant impacts | 22 | 48% |
| Recreational use (non-ORV) | 14 | 31% |
| Foot traffic/trampling | 13 | 28% |
| Road/trail construction/maint. | 10 | 22% |
| Other | 10 | 22% |
| ORV activity | 8 | 17% |
| Grazing | 5 | 11% |
| Vandalism/dumping/litter | 5 | 11% |
| Wood cutting or brush clearing | 5 | 11% |
| Disking | 4 | 8% |
| Non-native animal impacts | 4 | 8% |
| Agriculture | 1 | 2% |
| Improper burning regime | 1 | 2% |
Notes
| Threatened by development, alteration of fire regimes, trampling, vehicles, and recreational activities. Seriously threatened by non-native plants; annual non-native grasses are an indirect factor contributing to extirpation. No successful translocation attempts as of 1994. See Synoptical Flora of North America 1(2):446 (1884) for original description, University of California Publications in Botany 65:1-41 (1973) for taxonomic treatment, and Madroño 58(2):69-77 (2011) for information on the impacts of non-native plants and management implications. |
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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 31 October 2025].