Species Details

Lasthenia conjugens

Contra Costa goldfields

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Scientific Name:
Lasthenia conjugens Greene
Common Name:
Contra Costa goldfields
Family: Asteraceae
Element Code: PDAST5L040
USDA Plants Symbol: LACO6
Synonyms/Other Names:
Lifeform: annual herb
Blooming Period: Mar-Jun
Elevation:
0 - 470 meters
0 - 1540 feet
General Habitat:
  • Cismontane woodland
  • Playas (alkaline)
  • Valley and foothill grassland
  • Vernal pools
General Micro Habitat: mesic
Micro Habitat:
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 MadroƱo 50(2):83-93 (2003) for ecological information.
Threats:
Taxonomy:
Other:
References:
Total Occurrences: 36
Element Occurrence Ranks:
A B C D X U
2 12 1 0 11 10
Occurrence Status:
Historical >20 Years 19
Recent <=20 Years 17
Presence:
Presumed Extant 25
Possibly Extirpated 3
Presumed Extirpated 8
California Endemic:
California Island:
States: Name (Code)
California (CA)
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)*
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Map

Presumed Extant
Counties   Quads