knapweed

n.

黑矢车菊，矢车菊；

The impact of knapweed on Montana's economy
Effects of Sheep Grazing on a Spotted Knapweed-Infested Idaho Fescue Community
Introductory notes on squarrose knapweed (Centaurea virgata Lam. ssp. squarrosa Gugl.)
A Systems Approach for the Management of Russian Knapweed (Centaurea repens)
Effect of biocontrol insects on diffuse knapweed (Centaurea diffusa) in a Colorado grassland
Distribution, biology, and management of diffuse knapweed () and spotted knapweed ().
Revegetating Russian Knapweed ( Acroptilon Repens) Infestations Using Morphologically Diverse Species and Seedbed Preparation
Herbicide Effects on Density and Biomass of Russian Knapweed (Acroptilon repens) and Associated Plant Species
Distribution, biology, and management of diffuse knapweed (Centaurea diffusa) and spotted knapweed (Centaurea maculosa).
Distribution of yellow starthistle (Centaurea solstitialis) and Russian knapweed (Centaurea repens).