Mimulus mohavensis - J.G. Lemmon
Mojave Monkeyflower
Taxonomic Status: Accepted
Related ITIS Name(s): Mimulus mohavensis J.G. Lemmon (TSN 33262)
Unique Identifier: ELEMENT_GLOBAL.2.130595
Element Code: PDSCR1B1V0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Figwort Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Scrophulariales Scrophulariaceae Mimulus
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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: Mimulus mohavensis
Conservation Status
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NatureServe Status

Global Status: G2
Global Status Last Reviewed: 12Jan2006
Global Status Last Changed: 16Jan1990
Rounded Global Status: G2 - Imperiled
Reasons: Historically fairly abundant in a restricted area in the western Mojave, Mimulus mohavensis is now known from perhaps 25 sites in California. It is endemic to San Bernardino County. The population numbers fluctuate annually depending on rainfall. Many threats affect this plant including development, ORV use, mining, grazing and weeds. It is likely that no sites currently receive adequate protection. Better data are needed by the heritage program.
Nation: United States
National Status: N2

U.S. & Canada State/Province Status
United States California (S2)

Other Statuses

Comments on USESA: Was previously a candidate, but was removed from candidacy on February 28, 1996 in a notice of review.
U.S. Fish & Wildlife Service Lead Region: R1 - Pacific

NatureServe Global Conservation Status Factors

Range Extent Comments: California state endemic. Known from the approximate triangle formed by Victorville, Lucerne Valley and Barstow. Known only from San Bernardino County. Range extent is approximately 1560 sq miles.

Area of Occupancy: 1-25 4-km2 grid cells
Area of Occupancy Comments: The area of occupancy is approximately 655 acres.

Number of Occurrences: 21 - 80
Number of Occurrences Comments: In 2005/06, CNDDB knew of at least 36 EO's, 12 of which were historic. An additional 22 new pieces of data are in the backlog, but many may be updates.

Population Size Comments: Abundance is complicated by annual plants variable from year to year, depending on rainfall. About 7000 plants have been reported to CNDDB as of 2005/06.

Number of Occurrences with Good Viability/Integrity: Some (13-40)
Viability/Integrity Comments: 13 EO's are ranked good or better. There may be a few more.

Overall Threat Impact: Very high - high
Overall Threat Impact Comments: Threats include development of public land in Stoddard Valley, energy development, mining, and off-road vehicle use. Sheep grazing is a threat in certain parts of its range. Additional threats include road building, power line construction, and weed encroachment.

Short-term Trend: Decline of 10-30%
Short-term Trend Comments: The short term trend is one of partial decline.

Long-term Trend: Decline of <50% to Relatively Stable
Long-term Trend Comments: The long term trend is one of partial decline due to habitat loss and degradation.

Intrinsic Vulnerability Comments: Fragile annual which fluctuates in numbers widely, depending on rainfall.

Environmental Specificity: Narrow. Specialist or community with key requirements common.
Environmental Specificity Comments: Known only from fairly narrow range in the Western Mojave Desert.

Other NatureServe Conservation Status Information

Distribution
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Global Range: California state endemic. Known from the approximate triangle formed by Victorville, Lucerne Valley and Barstow. Known only from San Bernardino County. Range extent is approximately 1560 sq miles.

U.S. States and Canadian Provinces
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 Bernardino (06071)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
18 Mojave (18090208)+, Southern Mojave (18100100)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A small pubescent, glandular annual 4-7 cm tall. Corolla radial and salverform, color is maroon and white with maroon veins on petals.
Technical Description: Annual, 1-10 cm, more or less puberulent. Leaves 7-27 mm, narrowly elliptic, red-purple. Flowers: pedicel 2-5 mm; calyx 7-15 mm, enlarged in fruit, red-purple, more or less puberulent along veins, lobes spreading, more or less unequal, 2-4 mm, acuminate, ciliate; corolla radial, salveform, persistent, tube-throat 9-15 mm, tube-throat, limb at base solid maroon, veins maroon, fading into white border, appearing much less than 0.5 mm wide; placentas parietal. Fruit 8-13 mm. n=7. (Hickman 1993)
Diagnostic Characteristics: Can be distinguished from another mimulus that occurs in the area by its smaller size, and flower color.
Duration: ANNUAL
Reproduction Comments: Other related species are insect-pollinated, mostly outcross, but are also self compatible (Leclerc-Potvin and Ritland 1994). The dispersal vectors are probably abiotic, due to the size of this plant and its annual habit.
Ecology Comments: Dependent on spring rains as an annual.
Terrestrial Habitat(s): Desert, Forest/Woodland, Woodland - Hardwood
Habitat Comments: In the Western Mojave desert. Gravely banks of desert washes. 2000-3500 ft. Mojavean desert scrub and Joshua Tree Woodland.
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: 12Jan2006
NatureServe Conservation Status Factors Author: Julie A. Greene; rev. R. Bittman 2006
Element Ecology & Life History Edition Date: 18Mar1995
Element Ecology & Life History Author(s): JULIE A. GREENE

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
  • Bagley, M. 1991. Survey results for three rare Mohave Desert plants. prepared for the U.S. Fish and Wildlife Service.

  • California Department of Fish and Game, Natural Diversity Data Base. 1995. Rare Find Report.

  • California Native Plant Society. 1988. Status Report.

  • Eghbal, M.K., and R.J. Southard. 1993. Micromorphological evidence of polygenesis of three Aridisols, Western Mojave Desert, California. Soil Science Society America J. 57: 1041-1050.

  • 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.

  • Leclerc-Potvin, C., and K. Ritland. 1994. Modes of self fertilization in Mimulus guttatus: a field experiment. American J. Botany 81(2): 199-205.

  • Lemmon, J.G. 1884. On a new Mimulus of a peculiar section of the genus. Botanical Gazette 9: 141-143.

  • Skinner, M.W., and B.M. Pavlik, eds. 1994. Inventory of rare and endangered vascular plants of California. 5th. edition. California Native Plant Society Special Publication No. 1.

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