Species Details
Pentachaeta lyonii
Lyon's pentachaeta
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Species Description:
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.|
Scientific Name: Pentachaeta lyonii Gray |
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Common Name: Lyon's pentachaeta |
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| Family: | Asteraceae | |
| Element Code: | PDAST6X060 | |
| USDA Plants Symbol: | PELY4 | |
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Synonyms/Other Names: |
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| Name Status: |
JEP, FNA, POWO, IPNI, Tropicos |
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| CA Rare Plant Rank: | 1B.1 |
| Fed List: | FE (1997-01-29) |
| State List: | CE (1990-01-01) |
| Global Rank: | G1 |
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State Rank: |
S1 |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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| Add Date: | 1974-01-01 |
| Date Edited: | 2022-06-08 |
| Lifeform: annual herb | ||||||||||||||
Blooming Period: (Feb)Mar-Aug
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Elevation:
30 - 690 meters 100 - 2265 feet |
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General Habitats:
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| Microhabitat Details: | ||||||||||||||
Microhabitat:
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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: |
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| Threat List Total: | 14 | |
| Total EOs | % of EOs | |
| EOs with Threat Listed: | 38 | 84 % |
| THREAT LIST: | ||
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| 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% |
| Total Occurrences: | 45 | ||||
| Element Occurrence Ranks: | |||||
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| A | B | C | D | X | U |
| 3 | 19 | 10 | 3 | 6 | 4 |
| Occurrence Status: | |||||
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| Historical >20 Years | 26 | ||||
| Recent <=20 Years | 19 | ||||
| Presence: | |||||
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| Presumed Extant | 39 | ||||
| Possibly Extirpated | 5 | ||||
| Presumed Extirpated | 1 | ||||
| California Endemic: | |||||||||||||
| California Island: | |||||||||||||
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States: Name (Code) California (CA) |
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California Counties and Islands: Name (Code) Los Angeles (LAX), Ventura (VEN) |
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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) |
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Notes:
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Presumed Extant
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