Ecological Risk Screening Summary - Eel Grass (Vallisneria nana) - Uncertain Risk

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.

The history of invasiveness is not documented. There are records of a few introductions going back over 100 years but there have not been documented significant impacts or scientifically credible studies showing a lack of impact. The climate match is high; it is especially high for southern Texas. The certainty of assessment is low. The overall risk assessment category is uncertain due to the combination of an undocumented history of invasiveness but a high climate match.