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American basket-flower

Also known as: American star-thistle, powderpuff thistle

Plectocephalus americanus (Nutt.) D. Don

[=Centaurea americana Nutt. ]

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American basket-flower
American basket-flower inflorescence
American basket-flower habit
American basket-flower
American basket-flower

Morphology

Stem
Erect, sparingly branched above mid-stem, glabrous, minutely scabrous and minutely glandular.
Leaves
Alternate, simple, sessile, mostly entire, margins entire or minutely toothed, surfaces glabrous or scabrous, often dotted with minute yellow to brown glands; basal blades often absent at anthesis, oblanceolate to narrowly obovate, 4 to 8 inches long, .6 to 1.4 inches wide, angled or tapered to sharp point; cauline blades gradually reduced, ovate to lanceolate, mostly 2 to 4 inches long.
Inflorescence
Heads, hemispheric, borne singly at end of stem or branches, disciform, 1.2 to 3.2 inches across, showy. Involucres broadly hemispheric, 1 to 1.8 inches tall, wider than tall. Phyllaries many in 6-10 series, appressed, overlapping, of two distinct parts, lower part pale green, entire, upper part straw-colored, with a comb-like fringe of 9-15 stiff, parallel bristles.
Flower
Ray florets absent; discoid florets many, deeply 5-lobed, lobes linear; outer corollas larger, pink to occasionally purplish-red or rarely white, 1.4 to 2 inches, raylike, usually sterile; central corollas pinkish, .8 to 1 inch, usually fertile.
Fruit
Achenes, grayish brown to black, obovoid to oblong, .16 to .2 inch, somewhat flattened, glabrous or sparsely hairy; pappus bristles white, stiff, unequal, barbed, .24 to .55 inch.

Ecology

Habitat
Prairies, fields, roadsides, disturbed sites
Distribution
Collected in Meade, Neosho, Saline, and Woodson counties. Specimens from Meade and Neosho counties appear to be from introductions.

Practical Information

Uses
The Kiowa applied a poultice of leaves to skin sores (Moerman 1998).

Additional Notes

Comments

American basket-flower is not spiny though it is sometimes referred to as star-thistle or powderpuff thistle. The common name basket-flower alludes to the basket-like appearance of the overlapping phyllaries. It is sometimes cultivated as a garden ornamental.

Synonyms

Alternative scientific names that have been used for this plant.

Scientific Name: Centaurea americana

Full Citation: Centaurea americana Nutt.

Quick Facts
Plant Type
Wildflower
Family
Asteraceae - Sunflower Family
Life Span
Annual
Height
20-80 inches
Origin
Native
Last Updated
2021-11-19
Color Groups
Pink, Red & Orange Wildflowers
Flowering Period
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Blooms: June, July