Dodecahema leptoceras - (A. Gray) Reveal & Hardham
Slender-horned Spineflower
Synonym(s): Centrostegia leptoceras Gray ex Benth. ;Chorizanthe leptoceras (Gray ex Benth.) S. Wats.
Taxonomic Status: Accepted
Related ITIS Name(s): Dodecahema leptoceras (Gray ex Benth.) Reveal & Hardham (TSN 195646)
Unique Identifier: ELEMENT_GLOBAL.2.150862
Element Code: PDPGN0V010
Informal Taxonomy: Plants, Vascular - Flowering Plants - Buckwheat Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Polygonales Polygonaceae Dodecahema
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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: Dodecahema leptoceras
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 26Jul2016
Global Status Last Changed: 08Mar1988
Rounded Global Status: G1 - Critically Imperiled
Reasons: There are thirty five occurrences known with only 19 still extant. The habitat where this species occurs, alluvial terrace, is highly threatened by development, agriculture, off-road vehicle use, non native plants and other threats. The long term trend for this species is one of significant decline due to the alteration and degradation of its habitat, alluvial terrace. Further, short term decline is also quite steep.
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 (28Sep1987)
U.S. Fish & Wildlife Service Lead Region: R8 - California-Nevada

NatureServe Global Conservation Status Factors

Range Extent Comments: This species is known from the foothills of the San Gabriel Mountains in Los Angeles Co., the San Bernardino Mountains of San Bernardino Co., and the San Jacinto Mountains of western Riverside Co. (Flora North America vol. 5).

This species historically extended from the southern base of the Liebre Mountains, Western Transverse Ranges, and the western edge of the San Gabriel Mountains in Los Angeles Co. to the eastern edge of the range at Cajon Canyon in San Bernardino Co. From there it extends southeast from the Santa Ana River wash close to Redlands in San Bernardino Co.. From there it reaches southeast to the San Jacinto Mountains. Finally, it is known from the Temescal Canyon and southeast to Vail Lake/Dripping Springs area (CPC 2007).

Area of Occupancy: 126-2,500 4-km2 grid cells
Area of Occupancy Comments:  

Number of Occurrences: 6 - 20
Number of Occurrences Comments: A total of 35 occurrences are known, however, only 19 are non-historic.

Population Size Comments: 1000s of individuals at the San Jacinto River and Temescal Canyon sites.

Overall Threat Impact: Very high - high
Overall Threat Impact Comments: Habitat replaced by urbanization, agriculture. Urbanization in the Los Angeles area has significantly reduced the number of known norther occurrences (Flora North America vol. 5). Threatened by exotic annuals, sand and gravel mining, grazing, flood control, hydrological alteration, proposed reservoir construction, off road vehicles, and herbivory (CPC 2007).

Short-term Trend: Decline of >50%
Short-term Trend Comments: While several populations are known to be extirpated or historic, between 1/3-2/3 of the story of loss and decline is known. In other words, it is suspected that more decline is occurring than researchers know about (pers. comm. R. Bittman).

Long-term Trend: Decline of 70-90%
Long-term Trend Comments: The alluvial terrace habitat where this species lives has been severly altered, degraded and destroyed over the past 100 years (pers. comm. R. Bittman).

Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.
Environmental Specificity Comments: This species grows in alluvial fans, floodplains, stream terraces, washes and associated benches. It's found in riverbed alluvium high in silt and low in organic matter (CPC 2007).

Other NatureServe Conservation Status Information

Distribution
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Global Range: This species is known from the foothills of the San Gabriel Mountains in Los Angeles Co., the San Bernardino Mountains of San Bernardino Co., and the San Jacinto Mountains of western Riverside Co. (Flora North America vol. 5).

This species historically extended from the southern base of the Liebre Mountains, Western Transverse Ranges, and the western edge of the San Gabriel Mountains in Los Angeles Co. to the eastern edge of the range at Cajon Canyon in San Bernardino Co. From there it extends southeast from the Santa Ana River wash close to Redlands in San Bernardino Co.. From there it reaches southeast to the San Jacinto Mountains. Finally, it is known from the Temescal Canyon and southeast to Vail Lake/Dripping Springs area (CPC 2007).

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 Los Angeles (06037), Riverside (06065), San Bernardino (06071)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Santa Clara (18070102)+, Los Angeles (18070105)+, San Gabriel (18070106)+*, San Jacinto (18070202)+, Santa Ana (18070203)+, Santa Margarita (18070302)+, Whitewater River (18100201)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Terrestrial Habitat(s): Shrubland/chaparral
Habitat Comments: Old sandy benches or floodplain terraces containing alluvial fan scrub just below 2200 feet.
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: 15May2009
NatureServe Conservation Status Factors Author: Roth, E., (rev. 2009 L. Oliver and R. Bittman)

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
  • Center for Plant Conservation (CPC). 2007. CPC National Collection of Plants Profile: Dodecahema leptoceras. Available at http://www.centerforplantconservation.org/ASP/CPC_ViewProfile.asp?CPCNum=12921 (Accessed May 11, 2009).

  • Flora of North America Editorial Committee. 2005. Flora of North America North of Mexico. Vol. 5. Magnoliophyta: Caryophyllidae: Caryophyllales, Polygonales, and Plumbaginales. Oxford Univ. Press, New York. vii + 656 pp.

  • Kartesz, J. T. 1991. Synonym names from 1991 checklist, as extracted by Larry Morse, TNC, June 1991.

  • 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.

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