TNC Global Invasive Species Team page


	The Global Invasive Species Team

Introduction

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In many areas of the Pacific Northwest knapweeds (Centaurea spp.) have invaded and displaced native bunchgrasses. Here, a comparison of the roots of a native wheatgrass and the invasive non-native spotted knapweed (Centaurea maculosa, right) demonstrates a striking difference between the fibrous, soil-holding roots of the former and the thin taproot of the latter.

Slide 28

Center for Invasive Species and Ecosystem Health