Draba calcifuga - Lesica
Taxonomic Status: Provisionally accepted
Unique Identifier: ELEMENT_GLOBAL.2.143042
Element Code: PDBRA113J0
Informal Taxonomy: Plants, Vascular - Flowering Plants - Mustard Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Capparales Brassicaceae Draba
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Concept Reference
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Concept Reference: Lesica, P. 2009. Draba calcifuga (Brassicaceae), a New Species from the Rocky Mountains of North America. Novon 19(2): 182-186.
Concept Reference Code: A09LES01HQUS
Name Used in Concept Reference: Draba calcifuga
Taxonomic Comments: From Lesica (2009): Newly described in 2009, Draba calcifuga is similar to D. oligosperma in habit, leaf size and shape, fruit size and shape, style length, and in the presence of doubly pectinate trichomes on the leaves. However, D. calcifuga has cilia and pectinate trichomes with crisped branches that do not occur in D. oligosperma. Also, in the area of sympatry, Draba oligosperma occurs at lower elevations and primarily in calcareous soils (vs. the non-calcareous soils preferred by D. calcifuga), although D. oligosperma has wider ecological amplitude elsewhere. D. calcifuga may be derived from D. oligosperma. Although D. calcifuga is likely primarily asexual, it displays morphological, ecological, and geographical integrity.
Conservation Status
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NatureServe Status

Global Status: G3?
Global Status Last Reviewed: 20Feb2001
Global Status Last Changed: 20Feb2001
Rounded Global Status: G3 - Vulnerable
Reasons: A recently-described alpine species occurring in the Rocky Mountains of southwestern Montana, central Idaho, and northwestern Wyoming. At least 25 sites are known. The locations and habitats in which this species occurs are not generally impacted by human disturbance, and at least several sites are in designated wilderness areas. However, because this species is restricted to alpine areas, climate change is a concern.
Nation: United States
National Status: N3?

U.S. & Canada State/Province Status
United States Idaho (SNR), Montana (S3), Wyoming (SNR)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: At or above treeline in non-calcareous Rocky Mountain ranges in Beaverhead, Deer Lodge, Gallatin, Granite, Madison, Park, Powell, Ravalli, and Silver Bow counties in southwest Montana, Blaine and Lemhi counties in Idaho, and Park and Sublette counties in Wyoming. It is most common in the granitic-batholith Bitterroot, Pioneer, Anaconda, and Tobacco Root mountain ranges in Montana. Extent of occurrence is at least 50,000 square km (Lesica 2009).

Number of Occurrences: 21 - 80
Number of Occurrences Comments: Collections voucher at least 25 populations (Lesica 2009).

Overall Threat Impact: Low
Overall Threat Impact Comments: The species occurs above timberline in habitats that are generally not impacted by human disturbance (Lesica 2009).

Long-term Trend:  
Long-term Trend Comments: There is no reason to believe that there has been any reduction in population size (Lesica 2009).

Other NatureServe Conservation Status Information

Distribution
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Global Range: At or above treeline in non-calcareous Rocky Mountain ranges in Beaverhead, Deer Lodge, Gallatin, Granite, Madison, Park, Powell, Ravalli, and Silver Bow counties in southwest Montana, Blaine and Lemhi counties in Idaho, and Park and Sublette counties in Wyoming. It is most common in the granitic-batholith Bitterroot, Pioneer, Anaconda, and Tobacco Root mountain ranges in Montana. Extent of occurrence is at least 50,000 square km (Lesica 2009).

U.S. States and Canadian Provinces
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States ID, MT, WY

Range Map
No map available.

Ecology & Life History
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Basic Description: A perennial herb forming cushions 1-3 cm tall. Plants arise from a taproot surmounted by a short, thick, branched stem that is covered with old leaf bases; branches terminate in leaf rosettes. Each rosette gives rise to a flowering stem with 2-8 small flowers; each flower has 4 yellow petals. Flowering June through July, depending on aspect and elevation; mature fruit present July through September.
Technical Description: From Lesica (2009): "Caespitose, scapose, perennial herbs from a taproot surmounted by a caudex, forming cushions 1-3 cm tall; caudex branches covered with old leaf bases and terminating in rosettes. Leaves oblanceolate, entire, 1.5-5.5 x 0.5-1.1 mm, tapering to a petiole-like base; abaxial surface with sessile or stalked, pectinately branched trichomes sometimes mixed with stalked, stellate trichomes; adaxial surface glabrous or with sparse simple or branched trichomes; margins ciliate with twisted simple or few-branched trichomes; scapes erect, 4-25 mm, typically glabrous or rarely with stalked-stellate trichomes. Racemes 2- to 8-flowered, ebracteate; fruiting pedicels ascending, the lowest 1.2-5 mm; sepals ovate, 1.6-3 x 0.7-1.4 mm, glabrous or with sparse twisted, simple or forked trichomes; petals yellow, obovate, 2.3-4 x 1.2-2.1 mm, the claw 0.5-1 mm; filaments ca. 1.5 mm; anthers ca. 0.6 mm; silicles ovate, 2.5-5.3 x 1.9-3.5 mm with short, usually recurved, simple or forked trichomes 0.1-0.2 mm; fruiting style 0.2-0.6 mm; seeds 2 to 5 per silicle, 0.8-1.7 mm."
Diagnostic Characteristics: From Lesica (2009): "Vestiture of leaves, scapes, and silicles are important in delimiting Draba calcifuga from the other scapose species with doubly pectinate trichomes in the Rocky Mountains. Draba pectinipila and D. juniperina have sessile pectinate trichomes on the scape and silicles but lack cilia or stalked-stellate trichomes on the leaves as in D. calcifuga. Draba oligosperma has glabrous scapes and similar silicle vestiture as D. calcifuga but lacks cilia and stalked trichomes on the leaves. Draba incerta has stalked-pectinate trichomes and ciliate margins but has larger fruits than any of these other species."
Terrestrial Habitat(s): Alpine
Habitat Comments: An alpine species that appears to be restricted to non-calcareous soils; it has been found only on substrates derived from granitic, metamorphic, and volcanic parent materials, even though calcareous parent materials are common within much of its range (Lesica 2009).
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: 10Dec2009
NatureServe Conservation Status Factors Author: Gravuer, K.

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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  • Lesica, P. 2009. Draba calcifuga (Brassicaceae), a New Species from the Rocky Mountains of North America. Novon 19(2): 182-186.

  • Lesica, Peter. 2009. Draba calcifuga (Brassicaceae), a new species from the Rocky Mountains of North America. Novon 19: 182-186.

  • NatureServe. Unpublished. Concept reference for taxa which have not yet been described; to be used as a placeholder until a citation is available which describes the circumscription of the taxon.

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