Lasthenia conjugens GreeneContra Costa goldfieldsPrint Report |
© 2013 Neal Kramer |
Scientific Name: |
Lasthenia conjugens Greene |
Common Name: |
Contra Costa goldfields |
Family: | Asteraceae |
Element Code: | PDAST5L040 |
USDA Plants Symbol: | LACO6 |
Synonyms/Other Names: |
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Lifeform: | annual herb |
Blooming Period: Mar-Jun | Mar-Jun |
Elevation: | 0-470 (0-1540) |
General Habitats: | Cismontane woodland, Playas, Valley and foothill grassland, Vernal pools |
Microhabitat: | Mesic |
Microhabitat Details: |
CA Rare Plant Rank: | 1B.1 |
Global Rank: | G1 |
State Rank: |
S1 |
State List: | None |
Fed List: | FE |
Other Status: | SB_UCBG |
CRPR Changes: |
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Total Occurrences: | 36 |
Element Occurrence Ranks: | |
Excellent (A) | 2 |
Good (B) | 12 |
Fair (C) | 1 |
Poor (D) | 0 |
None (X) | 11 |
Unknown (U) | 10 |
California Endemic: True | |
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) | |
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)* |
Threat List Total: | 14 | |
EOs with Threat Listed: | Total EOs | % of EOs |
25 | 69 % | |
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% |
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 MadroƱo 50(2):83-93 (2003) for ecological information. |
Threats: |
Taxonomy: |