protocol for categorizing nonnative plants according to their negative impacts on biodiversity in
a large area such as a state, nation, or ecological region. Our objective was to provide a tool that makes the process of
identifying, categorizing, and listing nonnative plants that cause negative impacts to biodiversity analytic,
transparent, and equitable and that yields lists that are useful to researchers, land managers, regulators, consumers,
and commercial interests such as the nursery industry.