Species that are considered uncertain risk need a more in-depth assessment beyond the Risk Summary to better define the species’ risk to U.S. environments.
Longleaf Ludwigia (Ludwigia longifolia) is a semi-aquatic plant native to South America. This species has been present in the ornamental plant trade and has become established outside its native range via accidental releases from nurseries. Established nonnative populations have been reported from Florida, Australia, and Japan. Although several sources indicate potential adverse ecological effects from these introductions, verified impacts are currently lacking in the scientific literature. The history of invasiveness is thus classified as Data Deficient. The overall Climate 6 score for the contiguous United States was High, with high matches primarily found throughout the Southeast. The certainty of this assessment is Low due to a lack of information regarding the impacts of introductions. The overall risk assessment category is Uncertain.
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Uncertain Risk
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