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.
Yellow flag iris (Iris pseudacorus) is a wetland plant native to parts of Europe, Western Asia and North Africa. The history of invasiveness is high. The species has spread worldwide as an ornamental plant. It has resulted in exclusion of native species and complete alteration of habitats from non-forested to forested wetlands. Climate matching indicated the contiguous United States has a high climate match. There are established populations of I. pseudacorus in many states. The plant is prolific and has adapted to a wide variety of environmental conditions. The certainty of assessment is high. The overall risk assessment category is high.
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High Risk
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