Invasiveness and impact of 48 exotic plant species in native grasslands

By Pearson DE, YK Ortega, O Eren, JL Hierro. 

Researchers quantified and ranked invasiveness and impact of 48 exotic plants based on surveys in the bluebunch wheatgrass habitat type in western Montana. The 31 1-ha sites spanned 20,000 square kilometers of grasslands. Results provided valuable data for mangers when prioritizing exotic plants for control in the bluebunch wheatgrass habitat type. 

http://www.fs.fed.us/rmrs/science-spotlights/invasiveness-and-impact-48-exotic-plant-species-native-grasslands