Species Details

Camissonia benitensis

San Benito evening-primrose

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Photo of Camissonia benitensis
© 2005 David A Tharp
Photo of Camissonia benitensis
© 2005 David A Tharp
Photo of Camissonia benitensis
© 2006 Aaron Schusteff

Species Description:

Camissonia benitensis, commonly known as San Benito evening-primrose, is a annual herb in the Onagraceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Valley and foothill grassland, growing at elevations from 600 to 1280 meters. Camissonia benitensis is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

CA Rare Plant Rank: 1B.1
Fed List: FD (2022-03-07)
State List: None
Global Rank: G2
State Rank:
S2
Other Status: BLM_S; SB_SBBG; SB_UCBG
CRPR Changes:
Add Date: 1974-01-01
Date Edited: 2024-11-05
Lifeform: annual herb
Blooming Period: Apr-Jun
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Elevation:
600 - 1280 meters
1970 - 4200 feet
General Habitats:
  • Chaparral
  • Cismontane woodland
  • Valley and foothill grassland
Microhabitat Details: serpentinite alluvium
Microhabitat:
  • Carbonate (sometimes)
  • Gravelly (sometimes)
  • Serpentine
Notes:
Federally listed on 1985-02-12; Delisted due to Recovery on 2022-03-07. Known only from the New Idria area. Previously seriously threatened by vehicles. Protected in part at ACEC (BLM). See Contributions from the U.S. National Herbarium 37(5):332 (1969) for original description.
Threats:
Taxonomy:
Threat List Total: 8
Total EOs % of EOs
EOs with Threat Listed: 14 23 %
THREAT LIST:
ORV activity 11 18%
Recreational use (non-ORV) 5 8%
Other 4 6%
Grazing 4 6%
Non-native plant impacts 3 5%
Total Occurrences: 60
Element Occurrence Ranks:
A B C D X U
4 5 1 1 0 49
Occurrence Status:
Historical >20 Years 0
Recent <=20 Years 60
Presence:
Presumed Extant 60
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Fresno (FRE), Monterey (MNT), San Benito (SBT)
Quads: Name (Quad Code)
Hepsedam Peak (3612037), Hernandez Reservoir (3612047), Idria (3612046), Lonoak (3612038), Priest Valley (3612026), Rock Spring Peak (3612048), San Benito Mtn. (3612036), Santa Rita Peak (3612035)
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.
Presumed Extant
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