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Montana Field Guides

Antelope Bitterbrush - Purshia tridentata

Native Species

Global Rank: G4G5
State Rank: S4
(see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 4

External Links






State Rank Reason (see State Rank above)
See rank details.
  • Details on Status Ranking and Review
    Antelope Bitterbrush (Purshia tridentata) Conservation Status Review
    Review Date = 10/31/2012
    View State Conservation Rank Criteria
    Population Size

    Score0 - Large: Generally >100,000 individuals.

    Range Extent

    Score0 - Widespread species within Montana (occurs in 5% or more of the state or generally occurring in 6 or more sub-basins.) as well as outside of Montana.

    Area of Occupancy

    Score0 - High: Occurs in >25 Subwatersheds (6th Code HUC’s).

    Environmental Specificity

    Score0 - Low: Species is a generalist that occurs in a variety of habitats and/or is tolerant of disturbed or degraded habitats (C -Values of 1-4).

    Trends

    Score1 - Minor Declines: Species has experienced declines of 10-30% in population size, range extent and/or occupied area in the recent past (approximately 30 years).

    CommentMinor declines are likely from habitat conversion and alteration.

    Threats

    Score1 - Medium: 11-30% of the populations are being negatively impacted or are likely to be impacted by one or more activities or agents, which are expected to result in decreased populations and/or habitat quality and/or quantity.

    CommentVarious impacts and threats exist across the species' range in Montana though none are severe in magnitude.

    Intrinsic Vulnerability

    Score0-1 - Low to Moderate Vulnerability.

    Raw Conservation Status Score

    Score 2 to 4 total points scored out of a possible 19.

 
General Description
Intricately branched shrub to 2 m. Stems rigid, erect to ascending; bark brown, tomentose, becoming gray. Leaves fascicled on tips of short shoots, simple, sessile, fan-shaped, 7–18 mm long, shallowly 3-lobed at the tip, tomentose, sparsely so above, dense beneath, margins inrolled. Inflorescence of solitary, sessile flowers from tips of short shoots. Flowers perfect, perigynous; hypanthium obconic, tomentose, glandular, 4–6 mm long; sepals 5, ovate, 2–3 mm long; petals 5, clawed, yellow, 4–7 mm long; stamens ca. 25; pistil 1. Fruit a pubescent, ellipsoid achene, 9–14 mm long, partly enclosed in the hypanthium; style ca. 1 mm long. Stony or sandy soil of grasslands, steppe, open ponderosa-pine forest; valleys, montane(Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range

Year-round
 


Range Comments
BC, MT south to CA, AZ, NM and SD (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 306

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

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Stony or sandy soil of grasslands, steppe, open ponderosa-pine forest; valleys, montane

References
  • Additional ReferencesLegend:   View Online Publication
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    • Aldrich, D. F. 1978. Overwintering, springtime development and migration of some Aphidea, including Myzus persicae of Northwestern Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University. 112 p.
    • Fraas, W.W. 1992. Bitterbrush growth and reproductive character in relation to browsing in southwest Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 137 p.
    • Grove, A.J. 1998. Effects of Douglas fir establishment in southwestern Montana mountain big sagebrush communities. M. Sc.Thesis. Bozeman, MT: Montana State University. 150 p.
    • Guenther, G.E. 1989. Ecological relationships of bitterbrush communities on the Mount Haggin Wildlife Management Area. M.Sc. Thesis. Bozeman, MT: Montana State University. 73 p.
    • Harting, A.L. 1985. Relationships between activity patterns and foraging strategies of Yellowstone Grizzly Bears. M.Sc. Thesis. Bozeman, MT: Montana State University. 103 p.
    • Henderson, S. 1997. Effects of fire on avian distributions and patterns of abundance over two vegetation types in southwest Montana : implications for managing fire for biodiversity. M.Sc. Thesis. Bozeman, MT: Montana State University. 95 p.
    • Hoffman, T.L. 1996. An ecological investigation of mountain big sagebrush in the Gardiner Basin. M.Sc. Thesis. Bozeman, MT: Montana State University. 84 p.
    • Holeckek, J.L. 1976. Initial effects of different species treatments and fertilizer rates on a mine spoils rehabilitation. M.Sc. Thesis. Bozeman, MT: Montana State University. 91 p.
    • Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Lonner, T.N. 1972. Age distributions and some age relationships of key browse plants on big game ranges in Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 79 p.
    • Martin, P.R. 1973. Ecology of skunkbrush sumac (Rhus trilobata Nutt.) in Montana with special reference to use by mule deer. M.Sc. Thesis. Bozeman, MT: Montana State University. 97 p.
    • Martinka, R.R. 1970. Structural characteristics and ecological relationships of male blue grouse (Dendragapus obscurus (Say)) territories in southwestern Montana. Ph.D Dissertation. Bozeman, MT: Montana State University. 73 p.
    • Matlock-Cooley, S.J. 1993. Interaction between Deermice, Antelope Bitterbrush, and cattle in southwest Montana. M.Sc. Thesis. Bozeman, MT: Montana State University 84 p.
    • Morton, M.A. 1976. Nutritional values of major mule deer winter forage species in the Bridger Mountains, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 105 p.
    • Nyberg, H.E. 1980. Distribution, movements and habitat use of mule deer associated with the Brackett Creek winter range, Bridger Mountains, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 106 p.
    • O'Connor, K.S. 1987. Ecology of white-tailed deer and mule deer in agricultural lands in the Gallatin Valley, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 67 p.
    • Pac, D.F. 1976. Distribution, movements, and habitat use during spring, summer, and fall by mule deer associated with Armstrong winter range, Bridger Mountains, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 121 p.
    • Quire, R.L. 2013. The sagebrush steppe of Montana and southeastern Idaho shows evidence of high native plant diversity, stability, and resistance to the detrimental effects of nonnative plant species. M.Sc. Thesis. Bozeman, MT: Montana State University. 124 p.
    • Rosgaard, A.I., Jr. 1981. Ecology of the mule deer associated with the Brackett Creek winter range in the Bridger Mountains, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 76 p.
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Citation for data on this website:
Antelope Bitterbrush — Purshia tridentata.  Montana Field Guide.  .  Retrieved on , from