Taxon Details
Lasthenia conjugens
Contra Costa goldfields
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© 2013 Neal Kramer |
© 2013 Neal Kramer |
© 2011 Aaron Arthur |
Taxon Summary:
Lasthenia conjugens, commonly known as Contra Costa goldfields, is a annual herb in the Asteraceae that is found only in California. It occurs within Cismontane woodland, Playas (alkaline), Valley and foothill grassland, and Vernal pools, growing at elevations from 0 to 470 meters. Lasthenia conjugens is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.|
Scientific Name: Lasthenia conjugens Greene |
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Common Name: Contra Costa goldfields |
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| Family: | Asteraceae | |
| Element Code: | PDAST5L040 | |
| USDA Plants Symbol: | LACO6 | |
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Synonyms/Other Names: |
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| Name Status: |
JEF, FNA, POWO, IPNI, Tropicos |
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| CA Rare Plant Rank: | 1B.1 |
| Fed List: | FE (1997-06-18) |
| State List: | None |
| Global Rank: | G1 |
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State Rank: |
S1 |
| Other Status: | SB_UCBG |
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CRPR Changes: |
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| Add Date: | 1974-01-01 |
| Date Edited: | 2022-01-05 |
| Lifeform: annual herb | ||||||||||||||
Blooming Period: Mar-Jun
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Elevation:
0 - 470 meters 0 - 1540 feet |
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General Habitats:
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| Microhabitat Details: | ||||||||||||||
Microhabitat:
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Notes: Many historical occurrences extirpated by development and agriculture. Currently threatened by development, habitat alteration, hydrological alterations, overgrazing, and non-native plants. See Pittonia 1:221 (1888) for original description, and Madroño 50(2):83-93 (2003) for ecological information. |
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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: | 25 | 69 % |
| THREAT LIST: | ||
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| Development | 13 | 36% |
| Grazing | 8 | 22% |
| Non-native plant impacts | 7 | 19% |
| Disking | 4 | 11% |
| Agriculture | 3 | 8% |
| Other | 3 | 8% |
| Feral pigs | 2 | 5% |
| Altered flood/tidal/hydrologic regime | 2 | 5% |
| ORV activity | 2 | 5% |
| Landfill | 1 | 2% |
| Military operations | 1 | 2% |
| Erosion/runoff | 1 | 2% |
| Recreational use (non-ORV) | 1 | 2% |
| Wood cutting or brush clearing | 1 | 2% |
| Total Occurrences: | 36 | ||||
| Element Occurrence Ranks: | |||||
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| A | B | C | D | X | U |
| 2 | 12 | 1 | 0 | 11 | 10 |
| Occurrence Status: | |||||
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| Historical >20 Years | 19 | ||||
| Recent <=20 Years | 17 | ||||
| Presence: | |||||
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| Presumed Extant | 25 | ||||
| Possibly Extirpated | 3 | ||||
| Presumed Extirpated | 8 | ||||
| California Endemic: | |||||||||||||
| California Island: | |||||||||||||
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States: Name (Code) California (CA) |
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California Counties and Islands: Name (Code) Alameda (ALA), Contra Costa (CCA), Marin (MRN), Mendocino (MEN)*, Monterey (MNT), Napa (NAP), Santa Barbara (SBA)*, Santa Clara (SCL)*, Solano (SOL), Sonoma (SON) |
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Quads: Name (Quad Code) Antioch North (3812117), Antioch South (3712187), Benicia (3812212), Capell Valley (3812242)*, Cuttings Wharf (3812223), Denverton (3812128), Dos Pueblos Canyon (3411948), Elmira (3812138), Fairfield North (3812231), Fairfield South (3812221), Goleta (3411947)*, Marina (3612167), Milpitas (3712148), Napa (3812233), Newark (3712251)*, Petaluma River (3812225), Point Arena (3812386)*, Salinas (3612166), San Jose East (3712137)*, San Leandro (3712262), Seaside (3612157), Valley Ford (3812238), Walnut Creek (3712281)* |
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Notes:
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Presumed Extant
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