Primula maguirei - L.O. Williams
Maguire's Primrose
Synonym(s): Primula cusickiana var. maguirei (L.O. Williams) N. Holmgren & S. Kelso
Taxonomic Status: Accepted
Related ITIS Name(s): Primula maguirei L.O. Williams (TSN 24027)
Unique Identifier: ELEMENT_GLOBAL.2.143121
Element Code: PDPRI080B0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Primrose Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Primulales Primulaceae Primula
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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: Primula maguirei
Taxonomic Comments: Holmgren (2005) and FNA (vol. 8, 2009) reduce Primula maguirei (= P. cusickiana var. maguirei) to varietal status under P. cusickiana.
Conservation Status
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NatureServe Status

Global Status: G1
Global Status Last Reviewed: 21Sep2011
Global Status Last Changed: 02Apr1991
Rounded Global Status: G1 - Critically Imperiled
Reasons: A narrow endemic of Logan Canyon in Cache County, Utah. Using historical botanical species, no evidence of declines in numbers of populations or in the range of the species was found. Primula maguirei is most limited by the availability of suitable habitat (dolomitic cliffs and boulders with cool, moist microclimate). Threats include rock climbing activities, collecting, and potential highway improvements.
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 Utah (S1)

Other Statuses

U.S. Endangered Species Act (USESA): LT: Listed threatened (21Aug1985)
U.S. Fish & Wildlife Service Lead Region: R6 - Rocky Mountain

NatureServe Global Conservation Status Factors

Range Extent Comments: Limited area of Logan Canyon in Cache county, Utah (Tilley et al. 2011).

Area of Occupancy: 26-500 4-km2 grid cells
Area of Occupancy Comments: It is estimated that the area of occupancy would fit within eight 2x2 km grid cells (NatureServe element occurrence data 2011).

Number of Occurrences: 6 - 20
Number of Occurrences Comments: 6 known populations (Tilley et al. 2011).

Population Size Comments: It is estimated that 3000 individuals exist across all 6 populations (Tilley et al. 2011). Past surveys have produced estimates around 1000.

Overall Threat Impact Comments: Primary threats are road construction and water line development. Collecting, rock climbing, and other recreational activities are also ongoing threats (England 1990, Tilley et al. 2011)

Environmental Specificity: Very narrow. Specialist or community with key requirements scarce.
Environmental Specificity Comments: Restricted to cool, moss-covered dolomite cliffs and boulders at low elevations in Logan canyon. May also have physiological dependence on calcium and magnesium carbonates of substrate.

Other NatureServe Conservation Status Information

Distribution
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Global Range: Limited area of Logan Canyon in Cache county, Utah (Tilley et al. 2011).

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 UT

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
UT Cache (49005)
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
16 Middle Bear (16010202)+*, Little Bear-Logan (16010203)+
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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Basic Description: A perennial herb with stems approximately 4-10 cm tall, each bearing 1-3 showy, conspicuous lavender-colored flowers. Blooms May-June.
General Description: Small perennial with showy rosey lavender flowers and bright green basal leaves.
Technical Description: Perennial 4-15 cm tall; leaves oblanceolate to spatulate; calyx 5.5-7.5 mm long; corolla tube about twice as long as the calyx, the lobes 4-5 mm wide, obovate; corolla rose to lavender, conspicuous and showy, red-purple when dry; blooms April to May.
Diagnostic Characteristics: Similar to other Primula species but differs in having the calyx 5.5-7.5 mm long (to 9 mm long in fruit), and obovate corolla lobes 4-5 mm wide.
Duration: PERENNIAL
Reproduction Comments: Flowering mid-April to mid-May. Seed dispersal from May to June (England 1990).
Ecology Comments: Plant associates include pink alumroot (Huechera rubescens), mat rockspirea (Petrophytum caespitosum), tadpole buttercup (Ranunculus ranunclulinus), and narrowleaf wildparsley (Musineon lineare) (Tilley et al. 2011).
Terrestrial Habitat(s): Bare rock/talus/scree, Cliff
Habitat Comments: Damp ledges, crevices, and over-hanging rocks along canyon walls. Almost always on north-facing, moss covered limestone cliffs at or near the canyon bottom in shallow dolomitic soils of the Laketown and Fish Haven geologic formations (Tilley et al. 2011). 1350-1700 m elevation.
Economic Attributes
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Economic Comments: Attempts at cultivating this species were moslty unsuccessful (Tilley et al. 2011).
Management Summary
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Stewardship Overview: Continue to monitor known populations. Limit or prohibit recreational activities like rock climbing at known sites. Divert paths and new roads away from sites, and reconsider the proximity of campgrounds to sites. Ensure proper protection of sites, minimizing adverse damage, during inevitable road construction and water line devlopment (England 1990).
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: 21Sep2011
NatureServe Conservation Status Factors Author: Roth, E., rev. B. Franklin/K. Maybury (1996), rev. A. Treher (2011)
Management Information Edition Date: 21Sep2011
Management Information Edition Author: Treher, A.

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
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  • 100th Congress. 1988. Endangered Species Act of 1973, appropriations authorization for fiscal years 1988-1992. Public Law 100-478-October 7, 1988 102 STAT.2307-102 STAT.2323.

  • Atwood, D. 1986. Management plan for PRIMULA MAGUIREI.

  • Atwood, Duane. 1988. Management plan for Primula maguirei: Interagency agreement between U.S. Forest Service and U.S. Fish and Wildlife Service.

  • England, J.L. 1990. Maguire primrose (Primula maguirei) recovery plan. U.S. Fish and Wildlife Service, Denver, Colorado. 13 pp.

  • Flora of North America Editorial Committee. 2009. Flora of North America North of Mexico. Vol. 8. Magnoliophyta: Paeoniaceae to Ericaceae. Oxford University Press, New York. xxiv + 585 pp.

  • Holmgren, N. H. and S. Kelso. 2001. Primula cusickiana (Primulaceae) and its varieties. Brittonia 53: 154-156.

  • 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.

  • Kartesz, J.T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States, Canada, and Greenland. First edition. In: Kartesz, J.T., and C.A. Meacham. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden, Chapel Hill, N.C.

  • Padgett, W. G. 1986. Maguire Primrose, Status Report. Cache Valley Chapter of the Utah Native Plant Society.

  • S.L. Welsh. 1979. Status Report - Primula maguirei. (Updated by K. Woodbury, April 21, 1980, Uintah National Forest, Provo, Utah, and updated May 1986 by Duane Atwood.)

  • Shultz, L. M. 1984. Letter of June 7 to Robert Shields of the U.S. Fish and Wildlife Service.

  • Sibbernsen, J. 1994. Filed Message of April 12 for Wayne Padgett.

  • Tilley, D., L. St. John, and D. Ogle. 2011. Plant guide for Maguire's primrose (Primula cusickiana var. maguirei). USDA-Natural Resources Conservation Service, Idaho Plant Materials Center. Aberdeen, Idaho.

  • U.S. Fish and Wildlife Service (USFWS). 1990. Maguire primrose (Primula maguirei) recovery plan. U.S. Fish and Wildlife Service, Denver, Colorado. 13 pp.

  • U.S. Fish and Wildlife Service. 1985. Final rule to determine Primula maguirei (Maguire primrose) to be a threatened species. Federal Register 50(162): 33731-33734.

  • Welsh, S. L. 1987. Report prepared for the Utah Department of Transportation concerning populations of Primula maguirei in Logan Canyon.

  • Welsh, S.L., N.D. Atwood, S. Goodrich, and L.C. Higgins (eds.) 1993. A Utah flora. 2nd edition. Brigham Young Univ., Provo, Utah. 986 pp.

  • Williams, L.O. 1936. Revision of the Western Primulas. Amer. Midl. Naturalist 17(4): 741-748.

  • Winward, A.H. 1985. Letter of May 31 to Director RW.

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