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Montana Animal Field Guide

Montana Field Guides

Parry's Mountain Rabbitbrush - Ericameria parryi var. montana
Other Names:  Chrysothamnus parryi ssp. montanus

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Species of Concern

Global Rank: G5T2
State Rank: S2
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank: 3

External Links






State Rank Reason (see State Rank above)
A globally rare endemic, restricted to a small area of southwest Montana and adjacent Idaho. Though only known from one population in Montana with an estimated couple hundred plants, its habitat is remote and there are no apparent threats to its viability in the near future. Additional data on population levels and trend should be collected.
  • Details on Status Ranking and Review
    Parry's Mountain Rabbitbrush (Ericameria parryi var. montana) Conservation Status Review
    Review Date = 10/30/2012
    Population Size

    Score3 - Vey Small: Generally <2,000 individuals.

    Comment

    Range Extent

    Score3 - Local Endemic or Very Small Montana Range: Generally restricted to an area <10,000 sq. miles (equivalent to the combined area of Phillips and Valley Counties) or <6 Sub-basins (4th code watersheds) Range-wide OR limited to one Sub-basin in Montana

    Comment

    Area of Occupancy

    Score3 - Very Low: Generally occurring in 3 or fewer Subwatersheds (6th Code HUC’s).

    Comment

    Trends

    ScoreNA - Rank factor not assessed.

    CommentTrends are unknown, though declines, if any, probably are not severe.

    Threats

    Score0 - Low: Impacts, if any, to the species are expected to be minor or insignificant (affecting <10% of populations) in severity, scope and immediacy.

    CommentNo identified threats.

    Intrinsic Vulnerability

    Score0-1 - Low to Moderate Vulnerability.

    Comment

    Environmental Specificity

    Score2 - High: Species is restricted to a highly specialized and limited habitat and is typically dependent upon unaltered, high-quality habitat (C Values of 8-10).

    Comment

    Raw Conservation Status Score

    Score 11 to 12 total points scored out of a possible 16 (Rarity factors and threats only)

 
General Description
Chrysothamnus parryi ssp. montanus is a low growing, branching shrub with stems mostly covered by compacted, feltlike hairs (not always easy to see). It has linear leaves 0.5-1.5 inches long that are somewhat sticky to the touch. The inflorescence has one or a few heads and is overtopped by the uppermost stem leaves. Each head is about 0.5 inch long and usually contains 8-10 yellow disk flowers, but no ray flowers. The bracts forming the base of each head are lance-shaped with hairs spaced along the margins and long, pointed green tips. They overlay each other like shingles on a roof. The seeds have numerous long, thin, stiff hairs at the top.

Phenology
Flowering occurs in August - September.

Diagnostic Characteristics
Chrysothamnus parryi ssp. montanus is a low shrub with white stems, linear, glabrous leaves, the inflorescence overtopped by the uppermost leaves, and involucral bracts aligned in vertical ranks. This set of morphological characters combined with its high-elevation habitat distinguishes it from other similar species.

General Distribution
Mapped Observations

 


Distribution Comments
Ericameria parryi ssp. montanus is a narrow endemic known only from the Red Conglomerate Peaks area, near the Continental Divide, in the southern Beaverhead Range of Idaho and adjacent Montana. Its global distribution extends over an area approximately four miles wide by two miles wide. The four known occurrences are more or less evenly distributed across this limited range (Mancuso and Moseley 1990).

Summary of Observations Submitted for Montana
Number of Observations: 1
Number of Occurrences: 1

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Records associated with a range of dates are excluded from time charts)



Habitat
Sparsely-vegetated, subalpine grasslands and slopes usually on calcareous, gravelly to rocky soils.

Ecological Systems Associated with this Species

References
  • Additional ReferencesLegend:   View WorldCat Record   View Online Publication
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    • Anderson, L. C. 1978. New taxa in Chrysothamnus, section Nauseosi (Asteraceae). Phytologia 38(4): 309-320.
    • Anderson, L. C. 1986. An overview of the genus Chrysothamnus (Asteraceae). Pages 29-45 in E. D. McArthur and B. L. Welch, compilers, Proceedings- Symposium on the Biology of Artemisia and Chrysothamnus. USDA Forest Service General Technical Report INT-200. Intermountain Research Station, Ogden, UT.
    • Lesica, P. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX.
    • Lesica, P. 1992. Conservation status of Chrysothamnus parryi ssp. montanus on Beaverhead National Forest, Montana. Montana Natural Heritage Program, Helena. 21 pp.
    • Mancuso, M., and R. K. Moseley. 1990. Field investigation of Chrysothamnus parryi ssp. montanus, a Region 4 sensitive species, on the Targhee National Forest. Conservation Data Center, Idaho Department of Fish and Game, Boise, ID. 11 pp. plus appendices.
    • U.S. Department of Agriculture, Forest Service. Idaho and Wyoming endangered and sensitive plant field guide. [n.d.]. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Region. 192 p.
    • U.S. Department of Agriculture, Forest Service. Idaho and Wyoming endangered and sensitive plant field guide. [n.d]. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Region. Pp:86-87.
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Citation for data on this website:
Parry's Mountain Rabbitbrush — Ericameria parryi var. montana.  Montana Field Guide.  Montana Natural Heritage Program.  Retrieved on October 1, 2014, from http://FieldGuide.mt.gov/speciesDetail.aspx?elcode=PDAST2C098
 
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