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Bachelor's button

Also known as: bluebottle, cornflower

Centaurea cyanus L.

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Bachelor's button
Bachelor's button
Bachelor's button
Bachelor's button

Morphology

Stem
Erect or ascending, usually solitary, slender, green, densely white-woolly when young, openly branched at or above mid-point.
Leaves
Alternate; principal stem leaves entire, linear or linear-lanceolate, 1.6 to 4.6 inches long, 1/12 to 2/5 inch wide, grayish-woolly below; tip sharp-pointed; lower leaves sessile to short-stalked, sometimes toothed or lobed; upper leaves reduced, mostly sessile.
Inflorescence
Solitary heads, terminal on branch tips; many-flowered; involucre urn-shaped, 1/2 to 3/5 inch tall; involucral bracts ovate or lanceolate, overlapping, often purple-tinged; margins irregularly-cleft.
Flower
Head 3/5 to 1 inch wide; florets 25-35, corollas mostly blue, sometimes purple, pink, or white; corollas of central disc florets 2/5 to 3/5 inch long, bisexual; corollas of marginal florets enlarged, 4/5 to 1 inch long, sterile; lobes lanceolate.
Fruit
Achene, egg-shaped or oblong, 1/8 to 1/5 inch long, flattened, yellowish-brown to grayish-brown or nearly black, stiff-hairy, bristles many, stiff, unequal, 1/12 to 1/6 inch long, yellowish-brown to brown, enclosing small seed.

Ecology

Habitat
Roadsides, fields, waste places, disturbed sites; occurs sporadically and does not persist long.
Distribution
Infrequently throughout Kansas

Practical Information

Uses
Native Americans applied bruised leaves to sores. Herbals state that the flowers and seeds were boiled with wine and taken to treat spider bites and scorpion stings. Superstition held that bachelor's button would cause bread to mold when brought into the house. (Stevens)

Additional Notes

Comments

A widespread and somewhat weedy species. Bachelor's button is often planted in flower gardens and included in wildflower seed mixes and from there escapes to waste places and roadsides. Cyanus is from Greek kyanos, "sea-blue".

Quick Facts
Plant Type
Wildflower
Family
Asteraceae - Sunflower family
Life Span
Annual
Height
8-40 inches
Origin
Native
Last Updated
2009-03-12
Color Groups
Blue, Purple, Lavender & Violet Wildflowers
Flowering Period
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Blooms: July, August, September