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Pacific Yew - Taxus brevifolia

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

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

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State Rank Reason (see State Rank above)
See rank details.
  • Details on Status Ranking and Review
    Pacific Yew (Taxus brevifolia) Conservation Status Review
    Review Date = 05/24/2012
    Population Size

    Score0-1 - Moderate to Large: Population size is imprecisely known but is believed to be >10,000 individuals.

    Comment

    Range Extent

    Score1 - Peripheral, Disjunct or Sporadic Distribution in MT: Widespread species that is peripheral, disjunct or sporadically distributed within MT such that it occurs in <5% of the state (<7,500 sq. miles or the combined area of Beaverhead and Ravalli Counties) or is restricted to 4-5 sub-basins.

    Comment

    Area of Occupancy

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

    Comment

    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).

    Comment

    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.

    Comment

    Intrinsic Vulnerability

    Score0-1 - Low to Moderate Vulnerability.

    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 4 to 6 total points scored out of a possible 19.

 
General Description
Dioecious, evergreen shrub or small tree to 10 m tall with spreading or drooping branches forming an open, conical crown. Bark thin and brown or purplish. Leaves sharp-pointed, yellow-green above, paler beneath, 12–20 mm long, single but borne opposite each other in a single plane. Pollen cones solitary, globose, 2–3 mm long. Seed cones reduced to a single seed surrounded by a red, fleshy, pea-size, berry-like aril ca. 8 mm across. Seed 5–6 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

General Distribution
Mapped Observations

 


Distribution Comments
In MT in some northwestern counties and disjunct in Cascade County; 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: 19

(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

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:
Pacific Yew — Taxus brevifolia.  Montana Field Guide.  Montana Natural Heritage Program.  Retrieved on October 2, 2014, from http://FieldGuide.mt.gov/speciesDetail.aspx?elcode=PGTXA01010
 
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