Mountain Starthistle - Centaurea montana
Montane Knapweed, Mountain Cornflower, Mountain Bluet
Perennials, 30-70 cm tall. Stems simple or sparingly branched, sparsely tomentose. Leaves mostly 7-18 mm long, 1-4 mm wide, entire or nearly so. Inflorescence corymbiform or heads solitary; peduncles 1.5-7 cm long; involucres 2-2.5 chm high and as broad or broader; bracts imbricate, lanceolate to ovate-triangular with prominent blackish pectinate-lacerate margins extending to the base or nearly so, lacking a definte terminal appendage (except sometimes the inner); outer flowers blue, enlarged and subradiate; inner ones purplish; anthers blackish-purple; achenes short-hairy (pappus 1-1.5 mm long) (adapted from: Welsh et al., 1993, A Utah Flora, 2nd ed.).
Introduced as ornamental; scattered across northern parts of North America, less so in Great Plains and southern tier states and Southeast (Kartesz in prep. 2012).
Observations in Montana Natural Heritage Program Database
Number of Observations:
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(Observations spanning multiple months or years are excluded from time charts)
Persisting and sometimes spreading from cultivation.
- 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.
- Additional ReferencesLegend: View Online Publication
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- Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.