Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Garden Cornflower - Centaurea cyanus
Other Names:  Bachelor's Button, Blue Bottle, Cornflower

Non-native Species

Global Rank: GNR
State Rank: SNA

Agency Status
MNPS Threat Rank:
C-value: 1

External Links

General Description
Annual. Stems erect, branched, 20–60 cm. Herbage sparingly tomentose. Leaves petiolate below; blades linear-oblanceolate, 2–10 cm long, entire or with few linear lobes. Inflorescence corymbiform; heads solitary on branch tips. Involucres campanulate, 12–16 mm high; outer phyllaries ovate, green with a white to brown, scarious fringe at the tip; inner lanceolate with a blunt, white-fringed tip. Disk flowers 25 to 35, blue; the outer enlarged, resembling 5-lobed rays; inner corollas 11–15 mm long. Achenes 4–6 mm long; pappus bristles in 2 series (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Introduced ornamental sparingly escaped throughout most of North America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 11

(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)


  • 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.
    • Great Plains Flora Association (McGregor, R.L., coordinator, and T.M. Barkley, R.E. Brooks, and E.K. Schofield - eds.). 1986. Flora of the Great Plains. Lawrence, KS: Univ. Press Kansas. 1392 pp.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Web Search Engines for Articles on "Garden Cornflower"
Login Logout
Citation for data on this website:
Garden Cornflower — Centaurea cyanus.  Montana Field Guide.  .  Retrieved on , from