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.
Najas graminea, Ricefield waternymph, is a freshwater submersed, aquatic plant native to the subtropical and tropical regions of east Africa, Southeast Asia, and Australia. It has been introduced to parts of Europe and the United States (California) which has resulted in established, nonnative populations. N. graminea is present in the aquarium trade and has been suggested for use in bioremediation of heavy metals. The history of invasiveness for this species is Data Deficient due to the lack of information regarding impacts of introductions. The overall climate match for the contiguous United States was High. Most of the contiguous United States had a high or medium match except for much of the Rocky Mountains, parts of the Northeast, and parts of the Pacific Northwest. The certainty of assessment was Low due to the lack of information regarding this species impacts in the areas where it was introduced and has become established. Due to its high Climate 6 score and lack of information regarding impacts, the overall risk for this species is Uncertain.
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Uncertain Risk
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