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Montana Field Guide

Montana Field Guides

Narrowleaf Penstemon - Penstemon angustifolius

Species of Concern

Global Rank: G5
State Rank: S2S3
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank: 3
C-value:

External Links






State Rank Reason (see State Rank above)
Over a dozen, small extant and/or presumed extant occurrences are known in southeast Montana, plus a few historical collections from the same area. Only one of the known populations appears to be relatively large. Additional suitable, but unsurveyed habitat likely exists in eastern Montana.
  • Details on Status Ranking and Review
    Narrowleaf Penstemon (Penstemon angustifolius) Conservation Status Review
    Review Date = 05/29/2013
    View State Conservation Rank Criteria
    Population Size

    Score2-3 - Very Small to Small: Population size is imprecisely known but is believed to be <10,000 individuals.

    CommentMost occurrences are reported to have only a few plants up to a maximum of several dozen plants observed. The species was reported to be common at a few additional sites.

    Range Extent

    Score1-2 - Sporadic Distribution/Regional Endemic: Species is limited in distribution but is either too poorly documented or the information to precisely categorize it was lacking at the time its status was reviewed.

    Area of Occupancy

    Score2 - Low: Generally occurring in 4-10 Subwatersheds (6th Code HUC’s).

    Environmental Specificity

    Score1-2 - Moderate to High.

    CommentSandy soils, particulary in sandy blowouts.

    Trends

    ScoreNA - Rank factor not assessed.

    Threats

    Score0-1 - Low to Medium.

    Intrinsic Vulnerability

    Score1 - Moderate Vulnerability: Specific biological attributes, unusual life history characteristics or limited reproductive potential makes the species susceptible to extirpation from stochastic events or other adverse impacts to its habitat and slow to recover.

    Raw Conservation Status Score

    Score 7 to 11 total points scored out of a possible 16 (Rarity factors and threats only).

 
General Description
Narrowleaf Penstemon is a perennial herb with usually 1 erect stem 15-45 cm tall which arises from a taproot surmounted by a branched, woody crown. Basal leaves are 4-9 cm long and strap or narrowly lance-shaped with short petioles and entire margins. The opposite stem leaves are just as long but lack petioles. Foliage is glabrous, somewhat thickish, and often covered with a thin coat of bluish wax. The inflorescence consists of clusters of several short-stalked flowers in the axils of the reduced upper leaves. The tubular corolla is flared and 2-lipped at the mouth, 14-20 (23) mm long, and pink to lavender or bright blue, and glabrous externally. The 5 narrowly lance-shaped sepals are 4-8 mm long and have a narrow white margin. The 4 anthers are glabrous.

Our plants are variety angustifolius.

Phenology
Flowering in May-June.

Diagnostic Characteristics
The only other Penstemons in eastern Montana with a glabrous corollas are P. nitidus and P. grandiflorus but neither have linear leaves.

Species Range
Present
 


Range Comments
Great Plains, from ND to MT, and south from OK to AZ. Peripheral.

Summary of Observations Submitted for Montana
Number of Observations: 23

(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
Sandy-soiled, prairie grasslands on hills and slopes. Plants are often most abundant on sandy blowouts and other sparsely-vegetated areas. Common associated species include Andropogon scoparius, Bouteloua gracilis, Carex filifolia, Stipa comata, Calamovilfa longifolia, Tradescantia occidentalis, Artemisia campestris, Artemisia frigida, Heterotheca villosa, Helianthus rigidus and Yucca glauca.

Ecological Systems Associated with this Species

Ecology
Penstemon angustifolius is a short-lived perennial.

References
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Heidel, B.L. and K.H. Dueholm. 1995. Sensitive plant survey in the Sioux District, Custer National Forest, 1994, Carter County, Montana and Harding County, South Dakota. Unpublished report to the Custer National Forest. Montana Natural Heritage Program, Helena, Montana. 95 pp. plus appendices.
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Strickler, D. 1997. Northwest penstemons. Flower Press, Columbia Falls, Montana. 191 pages.
    • Vanderhorst, J.P., S.V. Cooper, and B.L. Heidel. 1998. Botanical and vegetation survey of Carter County, Montana. Unpublished report prepared for the Bureau of Land Management. Montana Natural Heritage Program, Helena. 116 pp. + app.
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Citation for data on this website:
Narrowleaf Penstemon — Penstemon angustifolius.  Montana Field Guide.  .  Retrieved on , from