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Montana Field Guides

Tilesius Wormwood - Artemisia tilesii

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Species of Concern
Native Species

Global Rank: G5
State Rank: S3
(see State Rank Reason below)
State Threat Score: No Known Threats
C-value: 4

Agency Status


External Links

State Rank Reason (see State Rank above)
Artemisia tilesii is known from seven locations located at higher elevations in western Montana. This species can be difficult to separate from Artemisia ludoviciana and A. michauxiana. Survey work to identify occurrences, determine population sizes, and assess threats is greatly needed.
  • Details on Status Ranking and Review
    Tilesius Wormwood (Artemisia tilesii) Conservation Status Review
    Review Date = 06/21/2018
    View State Conservation Rank Criteria
    Range Extent

    ScoreF - 20,000-200,000 sq km (~8,000-80,000 sq mi)

    Area of Occupancy

    ScoreD - 6-25 4-km2 grid cells

    Number of Populations

    ScoreB - 6 - 20

    Number of Occurrences or Percent Area with Good Viability / Ecological Integrity

    ScoreB - Very few (1-3) occurrences with excellent or good viability or ecological integrity

    Environmental Specificity

    ScoreB - Narrow. Specialist or community with key requirements common


    ScoreD - Low

    CommentNo known threats.

General Description
PLANTS: Herbaceous perennial that grows from coarse rhizomes (FNA 2006). Stems are simple (sometimes 2-3), erect, 30–80 cm, white, tomentose or glabrate, and mildly aromatic (Lesica et al. 2012; FNA 2006).

LEAVES: Basal and cauline blades are bicolor (green and white), linear to broadly lanceolate, 3-7(10) cm by 2-5(-6) cm, and coarsely pinnately lobed with ultimate segments acute (FNA 2006). Leaves are glabrate above (Lesica et al. 2012).

INFLORESCENCE: A narrow, leafy panicle (Lesica et al. 2012).

Flowering mid-summer to early fall (FNA 2006).

Species Range
Montana Range Range Descriptions


Range Comments
AK to QC south to OR, ID and MT (Lesica et al. 2012).

Observations in Montana Natural Heritage Program Database
Number of Observations: 8

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



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

Grasslands and meadows in the montane and subalpine zones of Montana (Lesica et al. 2012).
Predicted Suitable Habitat Model

This species has a Predicted Suitable Habitat Model available.

To learn how these Models were created see

Sagebrush in general is adapted to climates with cold winters where most precipitation falls in the winter (Meyer 2008). Shrubs in the genus Artemisia are important winter browse for ungulates (Meyer 2008). This species relies on wind for pollination and seed dispersal (Meyer 2008). Each seed is enclosed in a papery pericarp. The pericarp has mucilaginous nerves that may help the seed stick to the soil while its root penetrates (Meyer 2008).

Threats or Limiting Factors
Threat impact not assigned because threats are not known (MTNHP Threat Assessment 2021).

  • Literature Cited AboveLegend:   View Online Publication
    • Flora of North America Editorial Committee. 2006. Flora of North America North of Mexico. Vol. 19. Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. Oxford Univ. Press, New York. xxiv + 579 pp.
    • Flora of North America Editorial Committee. 2006. Flora of North America North of Mexico. Vol. 20. Magnoliophyta: Asteridae, part 7: Asteraceae, part 2. Oxford Univ. Press, New York. xxii + 666 pp.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Meyer, S.E. 2008. Artemisia L. in Bonner, F.T. and R.P. Karrfalt. The Woody Plant Seed Manual. Agric. Handbook No. 727. Washington, DC: USDA, Forest Service. 1223 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
Tilesius Wormwood — Artemisia tilesii.  Montana Field Guide.  .  Retrieved on , from