Common Yarrow - Achillea millefolium
(see State Rank Reason below)
MNPS Threat Rank
State Rank Reason (see State Rank above)
Abundant and widespread across Montana in various habitats. Also tolerant of disturbance.
Stems ascending to erect, simple, 6–60 cm. Herbage sparsely- to tangled-wooly. Leaves basal and cauline, petiolate below; blades narrowly oblanceolate, 1–15 cm long, finely, 3 times pinnately dissected; ultimate lobes 1–2 × 1 mm. Inflorescence hemispheric 2–15 cm across with numerous heads. Involucre 3–5 × 2–4 mm; bracts in 3 series; outer bracts green with brown, fimbriate margins, sparsely glandular. Rays 5 to 12, white (rarely pink); ligules 2–3 mm long, not quite as wide. Disk flowers white,10 to 30; corolla 2–5 mm long. Achenes glabrous, 1–2 mm long, obscurely winged (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Circumboreal and throughout temperate North America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
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, meadows, sagebrush steppe, open forest, talus, fellfields; all elevations (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
- Additional ReferencesLegend: View Online Publication
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- Bilbao, J.V. 2008. Predicting feeding site selection of mule deer on foothill and mountain rangelands. M.Sc. Thesis. Bozeman, MT: Montana State University. 40 p.
- Chadde, S.W. 1985. Initial recovery patterns of southwestern Montana foothill range. M.Sc. Thesis. Bozeman, MT: Montana State University. 103 p.
- Conway, T.M. 1982. Response of understory vegetation to varied lodgepole pine (Pinus contorta) spacing intervals in Western Montana. M.Sc. Thesis. Bpzeman, MT: Montana State University. 76 p.
- Foster, J.W. 1977. Impact of off-road vehicle traffic on soils and vegetation on rangeland in southeastern Montana and photographic monitoring of the effects. M.Sc. Thesis. Bozeman, MT: Montana State University. 168 p.
- Grove, A.J. 1998. Effects of Douglas fir establishment in southwestern Montana mountain big sagebrush communities. M. Sc.Thesis. Bozeman, MT: Montana State University. 150 p.
- Guenther, G.E. 1989. Ecological relationships of bitterbrush communities on the Mount Haggin Wildlife Management Area. M.Sc. Thesis. Bozeman, MT: Montana State University. 73 p.
- Hoard, M.W. 1985. Parameters influencing infrared reflectance of a vegetational canopy. M.Sc.Thesis. Bozeman, MT: Montana State University. 43 p.
- Johnson, T. W. 1982. An analysis of pack and saddle stock grazing areas in the Bob Marshall Wilderness. M.Sc.Thesis. Bozeman, MT: Montana State University. 105 p.
- Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.