FWS Focus

Overview

Characteristics
Overview

Bakersfield cactus is a perennial, low-growing succulent with fleshy, flattened, green, beavertail-like pads that produce showy magenta flowers. The eyespots on the pads contain spines in addition to bristles. The species occurs on sandy soil on floodplains, ridges, bluffs and rolling hills in saltbush scrub plant communities, and occasionally in blue oak woodland or riparian riparian
Definition of riparian habitat or riparian areas.

Learn more about riparian
woodland at elevations from 460 to 1,800 feet. 

Bakersfield cactus is native to Kern County in the southern San Joaquin Valley, California, and historically grew as continuous populations throughout the valley. In 1987, the colonies could be divided into five general population areas: the oilfields northeast of Oildale, Kern River Bluffs, and rolling hills west and north of Caliente Creek east of Bakersfield, Comanche Point on the Tejon Ranch southeast of Arvin and northwest of the community of Wheeler Ridge. Now, it is only found in a limited area of central Kern County near Bakersfield. The remaining Bakersfield cactus populations can be grouped into 11 general areas with only four core areas containing populations of greater than 1,000 clumps. Urban sprawl and the conversion of native habitat into agriculture have left the remaining populations small and highly fragmented. About one-third of the historical populations of Bakersfield cactus are gone. Current population trends are unknown.

This species was listed as endangered on July 19, 1990.

The cactus continues to be threatened by:

  • Climate change and extreme weather events
  • Habitat loss and urban sprawl
  • Habitat degradation
  • Mining exploration
  • Invasive non-native species, specifically grasses
  • Off-road vehicle use
  • Herbivory by pests, such as locusts

Scientific Name

Opuntia treleasei
Common Name
Bakersfield cactus
FWS Category
Flowering Plants
Kingdom

Location in Taxonomic Tree

Identification Numbers

TSN:

Characteristics

Characteristic category

Habitat

Characteristics
Habitat

Bakersfield cactus grows in sandy soil on floodplains, ridges, bluffs and rolling hills. The soil is typically low in silt or clay and low in organic material. Bakersfield cactus is a characteristic species of the Sierra-Tehachapi saltbush scrub plant community but are also found in blue oak woodland and riparian riparian
Definition of riparian habitat or riparian areas.

Learn more about riparian
woodland. Historical records indicate that the majority of Bakersfield cactus occurred at elevations ranging from 460 to 850 feet. The highest-elevation population is at 1,800 feet near Caliente and the lowest remaining is at 396 feet at Fuller Acres.

Grassland

Land on which the natural dominant plant forms are grasses and forbs.

Desert

Arid land with usually sparse vegetation.

Rural

Environments influenced by humans in a less substantial way than cities. This can include agriculture, silvaculture, aquaculture, etc.

Characteristic category

Physical Characteristics

Characteristics
Size & Shape

Like other beavertail cacti, Bakersfield cactus has fleshy green pads that can be rounded, heart-shaped or diamond-shaped to nearly cylindrical. A single plant may have hundreds of pads which grow both at ground level and from the tips of other pads. Clumps of Bakersfield cactus plants can grow up to 14 inches high and 33 feet across. The pads and fruits are dotted with eyespots which are rounded structures that contain barbed bristles and spines. Bakersfield cactus is different from other beavertail cacti, because it has spines in the eyespots. Tiny leaves are produced on the youngest pads of beavertail cacti but are shed quickly. Bakersfield cactus has showy magenta flowers. The dry fruits are the size and shape of small eggs and may contain grayish-white seeds.

Characteristic category

Life Cycle

Characteristics
Reproduction

Bakersfield cactus is a perennial. The life span of wild plants is not known but clumps have been known to live at least 48 years. Bakersfield cactus chiefly reproduce by fallen pads taking root, which they do easily when there is enough water. Bakersfield cactus doesn’t produce seeds often, and the warm, wet conditions seeds require to sprout aren’t common in the Bakersfield area. Bakersfield cactus typically flowers in May. Although its specific pollination biology hasn’t been studied, similar species need to be cross-pollinated with other individuals to grow seeds and many are pollinated by bees. One potential pollinator of Bakersfield cactus is the native solitary bee Diadasia australis caIifornica, a subspecies of chimney bee, which is found in Kern County and specializes in collecting pollen from Opuntia species.

Geography

Characteristics
Range

Bakersfield cactus is native to Kern County in the southern San Joaquin Valley, California, and historically grew as continuous populations throughout the valley. In 1987, the colonies could be divided into five general population areas: the oilfields northeast of Oildale, Kern River Bluffs, and rolling hills west and north of Caliente Creek east of Bakersfield, Comanche Point on the Tejon Ranch southeast of Arvin, and northwest of the community of Wheeler Ridge. Now, it is only found in a limited area of central Kern County near Bakersfield. The remaining Bakersfield cactus populations can be grouped into eleven general areas with only four core areas containing populations of greater than 1,000 clumps. Urban sprawl and the conversion of native habitat into agriculture have left the remaining populations small and highly fragmented. About one-third of the historical populations of Bakersfield cactus are gone. Current population trends are unknown.

Launch Interactive Map

Timeline

Explore the information available for this taxon's timeline. You can select an event on the timeline to view more information, or cycle through the content available in the carousel below.

5 Items

Listing

Listing

Five Year Review

Five Year Review

Five Year Review

1830
1840
1850
1860
1870
1880
1890
1900
1910
1920
1930
1940
1950
1960
1970
1980
1990
2000
2010
2020
2030
2040
2050
2060
2070
2080
2090
2100
2110
2120
2130
2140
2150
2160
1974
1975
1976
1977
1978
1979
1981
1982
1983
1984
1985
1986
1987
1988
1989
1991
1992
1993
1994
1995
1996
1997
1998
1999
2001
2002
2003
2004
2005
2006
2007
2008
2009
2011
2012
2013
2014
2015
2016
2017
2018
2019
2021
2022
2023
2024
2025
2026
2027
2028
2029
2031
2032
2033
2034

Listing

Jul 27, 1989

Jul 27, 1989 Listing (Endangered)
ETWP; Proposed Endangered or Threatened for Five Plants from Southern San Juaquin Valley; 54 FR 3120…
  • Publication type: Proposed
  • Population:
Item 1

Listing

Jul 19, 1990

Jul 19, 1990 Listing (Endangered)
ETWP; Determination of Endangered or Threatened Status for 5 Plants from the Southern San Joaquin Va…
  • Publication type: Final
  • Population:
Item 2

Five Year Review

Mar 22, 2006

Mar 22, 2006 Five Year Review (Information Solicitation)
Initiation of 5-Year Reviews of 56 Species in California and Nevada: Notice of review.
  • Publication type: Notice
  • Population:
Item 3

Five Year Review

Apr 27, 2012

Apr 27, 2012 Five Year Review (Completion)
5-Year Reviews of Species in California and Nevada
  • Publication type: Notice
  • Population:
Item 4

Five Year Review

Jul 26, 2019

Jul 26, 2019 Five Year Review (Information Solicitation)
Initiation of 5- Year Status Reviews of 58 Species in California, Nevada, and the Klamath Basin of…
  • Publication type: Notice
  • Population:
Item 5