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Western Redcedar - Thuja plicata

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Global Rank: G5
State Rank: S5
* (see State Rank Reason below)

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

External Links






State Rank Reason (see State Rank above)
See rank details.
  • Details on Status Ranking and Review
    Western Redcedar (Thuja plicata) Conservation Status Review
    Review Date = 05/24/2012
    Population Size

    Score0 - Large: Generally >100,000 individuals.

    Comment

    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.

    Comment

    Area of Occupancy

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

    Comment

    Trends

    Score0 - Stable or Increasing: Population size, range, and/or available habitat stable, increasing or fluctuating in the recent past (approximately 30 years).

    Comment

    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.

    Comment

    Intrinsic Vulnerability

    Score0 - Low Vulnerability: Species does not have any unusual or specific life history or biological attributes or limted reproductive potential which makes it susceptible to extirpation from stochastic events or other adverse impacts to its habitat and thus slow to recover.

    Comment

    Environmental Specificity

    Score1 - Moderate: Species is restricted to a specific habitat that is more widely distributed or to several restricted habitats and is typically dependent upon relatively unaltered, good-quality habitat (C Values of 5-7).

    Comment

    Raw Conservation Status Score

    Score 1 total point scored out of a possible 19.

 
General Description
Large evergreen trees to 60 m tall with reddish-brown, fibrous bark and a conical crown, monoecious. Lower trunk of older trees broad and often buttressed. Branchlets pendant, arrayed in flat sprays. Leaves glossy green, scale-like, opposite, overlapping, appressed against the flattened twigs. Pollen cones 1–3 mm long, reddish. Seed cones ellipsoid, 8–12 mm long, with 4 to 6 pairs of woody, overlapping scales, the top and bottom pairs sterile, maturing the first summer. Fertile scales with 2 seeds each (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

General Distribution
Mapped Observations

 


Distribution Comments
Northwestern MT counties; AK to CA, ID and MT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 261

(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
Moist to wet forest, especially along streams; valleys to montane (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
  • Additional ReferencesLegend:   View WorldCat Record   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX.
    • Little, E.L., Jr. 1979. Checklist of United States trees (native and naturalized). Agriculture Handbook No. 541. U.S. Forest Service, Washington, D.C. 375 pp.
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Citation for data on this website:
Western Redcedar — Thuja plicata.  Montana Field Guide.  Montana Natural Heritage Program.  Retrieved on October 20, 2014, from http://FieldGuide.mt.gov/speciesDetail.aspx?elcode=PGCUP06030
 
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