Tilesius Wormwood -
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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
Score F - 20,000-200,000 sq km (~8,000-80,000 sq mi) Area of Occupancy
Score D - 6-25 4-km2 grid cells Number of Populations
Score B - 6 - 20 Number of Occurrences or Percent Area with Good Viability / Ecological Integrity
Score B - Very few (1-3) occurrences with excellent or good viability or ecological integrity Environmental Specificity
Score B - Narrow. Specialist or community with key requirements common Threats
Score D - Low
CommentNo known threats.
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).
AK to QC south to OR, ID and MT (Lesica et al. 2012).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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Map Help and Descriptions
(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).
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
STATE THREAT SCORE REASON Threat impact not assigned because threats are not known (MTNHP Threat Assessment 2021).
Literature Cited Above
Legend: 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.