Species that are considered high risk have a well-documented history of invasiveness in at least one location globally, and a high or medium climate match to the contiguous United States.
Phalaris arundinacea is a perennial grass native to Eurasia and areas of the United States. The history of invasiveness is high. The species has been introduced for livestock forage, erosion control on banks, and as an ornamental species. It has had negative impacts on native species where it forms large stands. Climate matching indicated the contiguous United States has a high climate match. There are established populations of P. arundinacea in most of the contiguous United States The certainty of assessment is high. Substantial peer reviewed literature is available for this. The overall risk assessment category is high.
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