Page authors: Don Knoke, David Giblin
Centaurea nigrescens
short fringed knapweed, Tyrol knapweed

Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana and Wyoming, also from Great Lakes region east to northeastern North America.

Habitat: Roadsides, fields, ditches, wastelots, and other disturbed, open areas.

Flowers: July-September

Origin: Introduced from Europe

Growth Duration: Perennial

Conservation Status: Not of concern


Perennial, the stem 2-10 dm. tall, the herbage rough-puberulent to sub-glabrous.


Lower leaves oblanceolate, petiolate, often coarsely few-lobed; middle and upper leaves smaller, becoming sessile, mostly toothed to entire.


Heads terminating the numerous branches; involucre 11-18 mm. high, higher than broad; the middle and outer involucre bracts usually with comb-like, blackish appendages 1-3 mm. long; flowers all tubular, the marginal flowers enlarged; pappus none.



Accepted Name:
Centaurea nigrescens Willd.
Publication: Sp. Pl. 3: 2288. 1803. 1803.

Synonyms & Misapplications:
Centaurea dubia Suter [HC]
Centaurea dubia Suter ssp. nigrescens (Willd.) Hayek
Centaurea dubia Suter ssp. vochinensis (Bernh. ex Rchb.) Hayek
Centaurea jacea L. ssp. nigrescens (Willd.) Celakovsky
Centaurea transalpina Schleich. ex DC.
Centaurea vochinensis Bernh. ex Rchb.
Additional Resources:

PNW Herbaria: Specimen records of Centaurea nigrescens in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Centaurea nigrescens checklist entry.

OregonFlora: Centaurea nigrescens information.

E-Flora BC: Centaurea nigrescens atlas page.

CalPhotos: Centaurea nigrescens photos.

USDA Plants: Centaurea nigrescens information.

7 photographs:
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