Home/Species/ Elusive Jacob's-ladder

Polemonium elusum

J.J. Irwin & R.L. Hartman

Elusive Jacob's-ladder

G1Critically Imperiled Found in 1 roadless area NatureServe Explorer →

G1Critically ImperiledGlobal Rank

HighThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.1004644

Element CodePDPLM0E0U0

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicendemic to a single state or province

KingdomPlantae

PhylumAnthophyta

ClassDicotyledoneae

OrderSolanales

FamilyPolemoniaceae

GenusPolemonium

Concept Reference

Irwin, J.J., R. Stubbs, and R.L. Hartman. 2012. Polemonium elusum (Polemoniaceae), a new species from east central Idaho, U.S.A. Journal of the Botanical Research Institute of Texas 6(2): 331-338.

Taxonomic Comments

Polemonium elusum was discovered in 2010 and found to be a distinct species based on both morphological characters and molecular analysis (Irwin, et al. 2012).

Conservation Status

Rank MethodLegacy Rank calculation - Biotics v1

Review Date2020-01-06

Change Date2020-01-06

Edition Date2020-01-06

Edition AuthorsTomaino, A. (2017), rev. A. Tomaino (2020)

Threat ImpactHigh

Range Extent100-250 square km (about 40-100 square miles)

Number of Occurrences1 - 5

Rank Reasons

Described in 2012. Known only from the mountains and foothills surrounding the town of Ellis, east central Idaho. Threats include herbivory by ungulates.

Range Extent Comments

Occurs near the Salmon River, between Salmon and Challis, in east central Idaho (Irwin et al. 2012).

Occurrences Comments

There are nine collection sites within 8 sq km (Irwin et al. 2012). This may represent approximately 3-5 occurrences (Mancuso 2013).

Threat Impact Comments

Threats include herbivory by ungulates and invasive plants (Irwin et al. 2012). The vegetation is significantly impacted by cattle at one population (Irwin et al. 2012).

Ecology & Habitat

Habitat

Occurs where vegetation transitions from sagebrush and mountain mahogany to Douglas-fir woodland (Irwin et al. 2012).

Terrestrial Habitats

Forest/WoodlandWoodland - ConiferShrubland/chaparral

Other Nations (1)

United StatesN1

Province	Rank	Native
Idaho	S1	Yes

Threat Assessments

Threat	Scope	Severity	Timing
2 - Agriculture & aquaculture	Large (31-70%)	Serious or 31-70% pop. decline	—
2.3 - Livestock farming & ranching	Large (31-70%)	Serious or 31-70% pop. decline	—
8 - Invasive & other problematic species, genes & diseases	Large - restricted	Moderate or 11-30% pop. decline	—
8.1 - Invasive non-native/alien species/diseases	Restricted (11-30%)	Moderate - slight	—
8.2 - Problematic native species/diseases	Restricted (11-30%)	Moderate - slight	—

Plant Characteristics

Economic Value (Genus)No

Roadless Areas (1)

Idaho (1)

Area	Forest	Acres
Lemhi Range	Salmon-Challis National Forest	308,533

References (2)

Irwin, J.J., R. Stubbs, and R.L. Hartman. 2012. <i>Polemonium elusum</i> (Polemoniaceae), a new species from east central Idaho, U.S.A. Journal of the Botanical Research Institute of Texas 6(2): 331-338.
Mancuso, M. 2013. <i>Polemonium elusum </i>species account information. Idaho Native Plant Society, Boise.

Polemonium elusum

Habitat

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