Based on their assessment, the three most invasive taxa in Sweden are Campylopus introflexus (a moss native to the Southern hemisphere), Rosa rugosa (a shrub native to East Asia), and Epilobium adenocaulon (perennial herb native to North America). In fact, most of the listed species are the usual suspects but now there is black-on-white evidence for Sweden.
The paper is far from being a mere checklist. The authors also discuss several important implications for policy and management. For example, they identify foresters and gardeners as important actors facilitating the spread of invasive species and discuss the likelihood that their actions can be influenced.