This is the landing page for all versions of the United States Register of Introduced and Invasive Species (US-RIIS).
The US-RIIS is comprised of three lists, one each for Alaska (AK), Hawaii (HI), and the conterminous United States (L48). Each list includes taxonomic and ecological information about introduced (non-native), established (reproducing) taxa that: are, or may become, invasive (harmful) in the locality; that are not known to be harmful there; and/or that have been used for biological control in the locality.
To be included in the US-RIIS, a taxon must be non-native everywhere in the locality and established (reproducing) anywhere in the locality. Native pest species are not included.
Each record has information on taxonomy, a vernacular name, establishment means (introduced unintentionally, or assisted colonization), degree of establishment (established, invasive, or widespread invasive), hybrid status, pathway of introduction (where available), habitat (where available), dates of introduction (where available), associated taxa (where applicable), native and introduced distributions (where available), and citations for the authoritative source(s) from which this information is drawn.
