Vochin Knapweed

Centaurea nigrescens

Description

Differentiated from other knapweed species by its entire or coarsely lobed leaves that are lined with minute stiff hairs at the margins, and by the dark triangular tips on its bract, which is oblong (not urn-shaped, like that off spotted and diffuse knapweeds). Flowers are rose to purple.

Habitat

Roadsides, irrigations ditches, waste sites, orchards and pastures; cleared forested areas in the PNW

Distribution

Much of western Oregon; much of western Washington, especially around Puget Sound; eastern Washington border counties; northern Idaho and sporadic counties in the eastern part of the state

Impacts

Competes with native species; more information needed

Dispersal Methods

Vehicles, water, animals, or wind (if seed is plumed); spread intentionally as an ornamental

Prevention

Look for this species along roadsides, irrigation ditches, and in waste sites, orchards or pastures. It is important to remove all plant clipping, if cut, as it can resprout from fragments. Clean off shoes, vehicles, pets, and equipment if leaving an infested area.

Listings

Not listed

Factsheets

Vochin Knapweed Facts

Photos

http://images.google.com/images?q=Centaurea%20nigrescens

Distribution Map

Distribution in Oregon
Distribution in Washington
Distribution in Idaho

CWMA Warnings

Columbia Gorge