Chorizanthe orcuttiana - Parry
Orcutt's Spineflower
Taxonomic Status: Accepted
Related ITIS Name(s): Chorizanthe orcuttiana Parry (TSN 21019)
Unique Identifier: ELEMENT_GLOBAL.2.143762
Element Code: PDPGN040G0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Buckwheat Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Polygonales Polygonaceae Chorizanthe
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Chorizanthe orcuttiana
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 03Nov2015
Global Status Last Changed: 08Mar1988
Rounded Global Status: G1 - Critically Imperiled
Reasons: Endemic to San Diego County, California. Historically known from 10 sites, but the species has been observed at only 2 of these in recent years (and at only 1 site in the last 10 years). This single, definitely extant population is precariously small, occupying only about a 4 square m area. The site is located within a park, but a single event such as trampling by a large number of park visitors could eradicate it. Planned recreational development, including a community center and swimming pool, will eliminate potential maritime chaparral habitat within the park. Most of the habitat throughout the species' historic range has been destroyed and fragmented by recent, rapid, and ongoing urban development.
Nation: United States
National Status: N1

U.S. & Canada State/Province Status
Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
United States California (S1)

Other Statuses

U.S. Endangered Species Act (USESA): LE: Listed endangered (07Oct1996)
U.S. Fish & Wildlife Service Lead Region: R8 - California-Nevada

NatureServe Global Conservation Status Factors

Range Extent Comments: Known only from San Diego County, California.

Number of Occurrences: 1 - 5
Number of Occurrences Comments: One known extant. But more sites possible. Annual - seed bank may exist where not seen recently.

Population Size Comments: Unknown.

Overall Threat Impact: Very high - medium
Overall Threat Impact Comments: Development is a great threat. This species is also threatened by foot traffic (CNPS 2001), as well as on going field projects, illegal alien campsites, parking lot construction, development of park land and trail construction (CNDDB 2003). This species is greatly threatened due to it's low numbers.

Short-term Trend Comments: Most historic habitat is now urbanized.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Known only from San Diego County, California.

U.S. States and Canadian Provinces

Due to latency between updates made in state, provincial or other NatureServe Network databases and when they appear on NatureServe Explorer, for state or provincial information you may wish to contact the data steward in your jurisdiction to obtain the most current data. Please refer to our Distribution Data Sources to find contact information for your jurisdiction.
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States CA

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
CA San Diego (06073)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 San Luis Rey-Escondido (18070303)+, San Diego (18070304)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: An annual herb with prostrate, yellowish stems, 1-15 cm long. Yellow, densely hairy flowers (2.5-4 mm) bloom March-April.
Technical Description: "Branched from base, somewhat pubescent, the stems prostrate, 0.3-1 dm long; leaves basal, narrowly oblanceolate, petioled, 1-3 cm long; lower bracts opposite, foliaceous, the upper reduced, acerose; involucres mostly solitary in axils of the cymes, 3-angled, the tube circa 2 mm long, the 3 teeth almost as long, squarrose, hooked at tip, calyx cylindric, 2-2.5 mm long, with erect lance-linear pubescent lobes; stamens 9; akenes smooth, dark brown, narrow, 3-angled, almost 2 mm long" (Munz, 1959).
Diagnostic Characteristics: Chorizanthe orcuttiana can be distinguished by the ring of bracts surrounding the flower in 3. Plants are prostrate. (Munz, 1959)
Duration: ANNUAL
Terrestrial Habitat(s): Shrubland/chaparral
Habitat Comments: Open areas with sandy soils within low, farily open southern maritime chaparral communities.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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NatureServe Conservation Status Factors Edition Date: 09Sep1991
NatureServe Conservation Status Factors Author: Russell, C., rev. Maybury (1997)
Element Ecology & Life History Edition Date: 05Jun1992

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • Abrams, L. 1944. Illustrated flora of the Pacific states: Washington, Oregon, and California. Vol. 2. Polygonaceae to Krameriaceae. Stanford Univ. Press, Stanford, California. 635 pp.

  • California Department of Fish and Game. 2000. Natural Diversity Database (RareFind 2), Version 2.1.2, January 25, 2000. Downloaded in 2003.

  • California Native Plant Society (CNPS). 2001. Inventory of Rare and Endangered Plants of California (sixth edition). Rare Plant Scientific Advisory Committee, David P. Tibor, Convening Editor. California Native Plant Society. Sacramento, CA. x + 388pp.

  • Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Munz, P.A., with D.D. Keck. 1959. A California flora. Univ. California Press, Berkeley. 1681 pp.

  • Smith, J.P., and K. Berg. 1988. California native plant society's inventory of rare and endangered vascular plants of California. 4th edition. California Native Plant Society, Sacramento. 168 pp.

  • U.S. Fish and Wildlife Service. 1996. Determination of endangered or threatened status for four southern maritime chaparral plant taxa from coastal southern California and northwestern Baja California, Mexico. Federal Register 61(195): 52370-52384.

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