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Draba taylorii

G.A. Mulligan & Al-Shehbaz

Taylor's Draba

G3Vulnerable Found in 5 roadless areas NatureServe Explorer →
G3VulnerableGlobal Rank
MediumThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.938636
Element CodePDBRA113Y0
Record TypeSPECIES
ClassificationSpecies
Classification StatusProvisional
Name CategoryVascular Plant
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderCapparales
FamilyBrassicaceae
GenusDraba
Synonyms
Draba tayloriG.A. Mulligan & Al-Shehbaz
Other Common Names
Drave de Taylor (FR)
Concept Reference
Al-Shehbaz, I.A., and G.A. Mulligan. 2013. New or noteworthy species of Draba (Brassicaceae) from Canada and Alaska. Harvard Papers in Botany 18(2): 101-124.
Taxonomic Comments
Accepted spelling in VASCAN (2023) and Giblin (2022) is Draba taylorii.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2024-01-29
Change Date2024-01-29
Edition Date2023-12-26
Edition AuthorsNordman, C. (2023).
Threat ImpactMedium
Range Extent1000-5000 square km (about 400-2000 square miles)
Number of Occurrences6 - 20
Rank Reasons
Taylor's Draba (Draba taylorii) occurs in alpine or upper subalpine areas of the North Cascades Range of western North America, it is known from southern British Columbia, and Okanogan County, Washington. It is estimated that there are about eight occurrences, including in Cathedral Provincial Park in British Columbia, and on Chopaka Mountain Natural Area Preserve and Okanogan-Wenatchee National Forest in Washington. Livestock grazing or trampling is a minor potential threat, populations are small and may be vulnerable to avalanche, rock fall, drought, and other stochastic events. Long term climate change is a threat, including extreme temperatures and drought.
Range Extent Comments
Taylor's Draba (Draba taylorii) occurs in alpine or upper subalpine areas of the North Cascades Range of western North America, it is known from southern British Columbia, between Pyramid and McKeen Mountains in the Ashnola Range, and in Okanogan County, Washington (Al-Shehbaz and Mulligan 2013, Fertig 2020, GBIF 2023, Giblin 2022, Hitchcock and Cronquist 2018, iNaturalist 2023, NatureServe 2023, SEINet 2023).
Occurrences Comments
By applying a 1 km separation distance to herbarium specimens, photo-based observations, and NatureServe Network occurrence data documented between 1992 and 2023, it is estimated that there are about eight, and between six and 20 occurrences rangewide (GBIF 2023, Giblin 2022, iNaturalist 2023, NatureServe 2023, SEINet 2023).
Threat Impact Comments
Taylor's Draba (Draba taylorii) occurs at higher elevations in remote and rocky areas, so threats related to landuse, resource use and recreation are low or minimal. Livestock grazing or trampling is a minor potential threat in the Chopaka Mountain Natural Area Preserve. This species may be apomictic, not producing viable pollen, so it may have difficulty establishing new populations. Most of the populations are small and may be vulnerable to avalanche, rock fall, drought, and other stochastic events. Long term climate change is a threat, including extreme temperatures and drought (Fertig 2020).
Ecology & Habitat

Diagnostic Characteristics

Use of botanical keys is important to identify Taylor's Draba (Draba taylorii), it is similar to and easily confused with Draba novolympica, D. incerta, D. paysonii, and D. densifolia, but it is distinguished by having leaves with crisped branched trichomes, and other characters (Al-Shehbaz and Mulligan 2013, Fertig 2020).

Habitat

Taylor's Draba (Draba taylorii) occurs in cracks or rock ledges with thin soils in alpine and subalpine areas, at the edge of krummholz dominated by Pinus albicaulis and Juniperus communis. Common associated species in the Tiffany Mountain area (at about 2177 meters) include Antennaria umbrinella, Carex scirpoidea, Cherleria obtusiloba, Draba novolympica, Erigeron compositus, Penstemon davidsonii, Potentilla glaucophylla, Saxifraga bronchialis, and Smelowskia americana. At Chopaka Mountain it is in a flat summit fellfield of metagabbro boulders and bedrock interspersed with dense turf of Carex engelmannii, Juncus drummondii, and Trisetum spicatum (Fertig 2020). In the Hart's Pass area it occurs in dry soil along a ridgeline (at about 2417 meters) with Phlox diffusa, Saxifraga austromontana, and Senecio fremontii (Giblin 2022).

Reproduction

The anthers produce no fertile pollen, and this species may be apomictic, and it may have difficulty establishing new populations (Al-Shehbaz and Mulligan 2013, Fertig 2020).
Terrestrial Habitats
Alpine
Other Nations (2)
CanadaN3
ProvinceRankNative
British ColumbiaS3Yes
United StatesN1
ProvinceRankNative
WashingtonS1Yes
Threat Assessments
ThreatScopeSeverityTiming
2 - Agriculture & aquacultureSmall (1-10%)Moderate or 11-30% pop. declineHigh (continuing)
2.3 - Livestock farming & ranchingSmall (1-10%)Moderate or 11-30% pop. declineHigh (continuing)
11 - Climate change & severe weatherPervasive (71-100%)Moderate or 11-30% pop. declineHigh (continuing)
11.2 - DroughtsPervasive (71-100%)Moderate or 11-30% pop. declineHigh (continuing)
11.3 - Temperature extremesPervasive (71-100%)Moderate or 11-30% pop. declineHigh (continuing)

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Plant Characteristics
DurationPERENNIAL
Economic Value (Genus)No
Roadless Areas (5)
Washington (5)
AreaForestAcres
Canyon CreekWenatchee National Forest7,983
Heather LakeWenatchee National Forest10,628
Long SwampOkanogan National Forest66,344
Nason RidgeWenatchee National Forest19,329
TiffanyOkanogan National Forest22,045
References (9)
  1. Al-Shehbaz, I.A., and G.A. Mulligan. 2013. New or noteworthy species of <i>Draba</i> (Brassicaceae) from Canada and Alaska. Harvard Papers in Botany 18(2): 101-124.
  2. Brouillet, L., F. Coursol, S.J. Meades, M. Favreau, M. Anions, P. Bélisle, and P. Desmet. 2023. VASCAN, the Database of Vascular Plants of Canada. Online. Available: http://data.canadensys.net/vascan/ (Accessed 2023).<br/>
  3. Fertig, W. 2020. Potential Federal Candidate Plant Species of Washington. Prepared for the U.S. Fish and Wildlife Service. Western Washington Fish and Wildlife Office, Region. 1. Washington Natural Heritage Program Report Number: 2020-01. Online. Available: https://www.dnr.wa.gov/publications/amp_nh_potential_candidate_sp.pdf (accessed 15 Feb 2022).
  4. Giblin, D.E. 2022. Noteworthy collections. Madroño 69(1): 4-5.
  5. Global Biodiversity Information Facility (GBIF). 2023. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2023).
  6. Hitchcock, C.L., and A. Cronquist. 2018. Flora of the Pacific Northwest: An illustrated manual. Edited by D.E. Giblin, B. S. Legler, P.F. Zika, and R. G. Olmstead. 2nd edition. Univ. Washington Press, Seattle. xiii + 822 pp.
  7. iNaturalist. 2023. Online. Available: https://www.inaturalist.org (accessed 2023).
  8. NatureServe. 2023. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
  9. Southwest Environmental Information Network (SEINet). 2023. Collections Databases. Online. Available: https://swbiodiversity.org/seinet/collections/index.php (accessed 2023).