Home/Species/ Maguire's Whitlow-grass

Draba maguirei

C.L. Hitchc.

Maguire's Whitlow-grass

G2Imperiled Found in 3 roadless areas NatureServe Explorer →

G2ImperiledGlobal Rank

Very high - highThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.131988

Element CodePDBRA111J2

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicendemic to a single state or province

KingdomPlantae

PhylumAnthophyta

ClassDicotyledoneae

OrderCapparales

FamilyBrassicaceae

GenusDraba

Synonyms

Draba maguirei sensu strictoC.L. Hitchc.Draba maguirei var. maguirei

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.

Taxonomic Comments

This record is for the treatment of Draba maguirei in the narrow sense (=D. maguirei var. maguirei sensu Kartesz 1994 and 1999), excluding Draba burkei. FNA (2010, vol. 7) and Windham et al. (2023) accept D. burkei as a species, distinct from D. maguirei. Additionally, Windham et al. (2023) distinguish subspecies within D. maguirei (ssp. maguirei and ssp. stonei).

Conservation Status

Rank Method Rank calculation - Biotics v2

Review Date2021-11-18

Change Date1996-02-27

Edition Date2021-11-18

Edition AuthorsMcCormick, M., M. Wheeler, L. Oliver

Threat ImpactVery high - high

Range Extent250-1000 square km (about 100-400 square miles)

Number of Occurrences6 - 20

Rank Reasons

This taxon is endemic to the Bear River Range in Cache Co., Utah. There are 14 populations that are known, and while there is a limited distribution, these populations seem healthy and relatively stable. Current threats are from invasive species, and if the proposed introduction of mountain goats occur, the threat leel would increase.

Range Extent Comments

This species is endemic to the Bear River Range in Cache County, Utah. Plants from the northern Wasatch Mountains in Box Elder, Cache, and Weber counties are Draba burkei.

Occurrences Comments

The number of occurrences for this species assumes a separation distance of 2 km. This plant is fairly abundant and widespread in the Logan Naomi wilderness area (NatureServe 2021).

Threat Impact Comments

Invasive plant species threats are minor, but include Isatis tinctoria and Melilotus officianalis, based on information from the Utah Natural Heritage Program (2021). The only observable threat may be from hikers, however, this threat is considered low. The USU Logan Canyon Climbing Management Plan for the Uintah-Wastach-Cache National Forest, Logan Ranger District (2017) specifically addressed management in relation to climbing and increasing public awareness to reduce the threat of rock climbing on this species. The proposed introduction of mountain goats would negatively impact this species.

Ecology & Habitat

Habitat

This species occurs in the crevices of rock outcrops or shallow, rocky soils in the vicinity of rock outcrops. It is restricted to carbonate substrates. The elevation range of known occurrences is from 1,676 to 2,926 m. Lower-elevation sites are typically in openings of Douglas-fir forest on north- or east-facing slopes.

Terrestrial Habitats

Bare rock/talus/scree

Other Nations (1)

United StatesN2

Province	Rank	Native
Utah	SNR	Yes

Threat Assessments

Threat	Scope	Severity	Timing
6 - Human intrusions & disturbance	Restricted (11-30%)	Slight or 1-10% pop. decline	High (continuing)
6.1 - Recreational activities	Restricted (11-30%)	Slight or 1-10% pop. decline	High (continuing)
8 - Invasive & other problematic species, genes & diseases	Pervasive - large	Extreme - serious	High (continuing)
8.1 - Invasive non-native/alien species/diseases	Pervasive - large	Extreme - serious	High (continuing)
8.1.2 - Named species	Pervasive - large	Extreme - serious	High (continuing)

Plant Characteristics

DurationPERENNIAL

Economic Value (Genus)No

Roadless Areas (3)

Utah (3)

Area	Forest	Acres
Gibson	Wasatch-Cache National Forest	5,350
Mollens Hollow	Wasatch-Cache National Forest	17,690
Mt. Naomi	Wasatch-Cache National Forest	41,922

References (8)

Flora of North America Editorial Committee (FNA). 2010. Flora of North America north of Mexico. Vol. 7. Magnoliophyta: Salicaceae to Brassicaceae. Oxford University Press, New York. xxii + 797 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.
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.
Stephens, Camille (2017). Logan Canyon climbing management Plan for the Uinta-Wasatch_Cache National Forest, Logan Ranger District. Utah State University, Logan UT. 33pp
Utah Native Plant Society (UNPS). 2003-2021. Utah rare plant guide. A.J. Frates editor/coordinator. Salt Lake City, UT. Utah Native Plant Society. Online. Available: https://www.utahrareplants.org (accessed 2021).
Utah Natural Heritage Program. 2021. Utah Rare Plant Database (accessed 2021).
Welsh, S.L., N.D. Atwood, S. Goodrich, and L.C. Higgins. (Eds). 2015. A Utah flora, fifth edition, revised 2015. Monte L. Bean Life Science Museum, Provo, Utah. 987 pp.
Windham, M.D., K.T. Picard, and K.M. Pryer. 2023. An in-depth investigation of cryptic taxonomic diversity in the rare endemic mustard <i>Draba maguirei</i>. American Journal of Botany 110(3): 1-22.

Draba maguirei

Habitat

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