Close Window

Figure 1   Spotted knapweed (Centaurea maculosa) populations. In its native European habitat, spotted knapweed (center of photograph) coexists with numerous other plant species (left panel). In its introduced range of North America, spotted knapweed is capable of displacing natives and forming dense monocultures (right panel). (Photographs taken by Giles Thelen and Dean Pearson; www.plantecology.org.)

Close Window