Explore invasive species.

Species records are spread across agency websites, research collections, and monitoring programs. We bring them together here, with the original sources close at hand. Open a county finding to see who reported it, when it was recorded, and what the evidence tells us.

Our catalog begins with the US-RIIS register for the lower 48 states. We also research Alaska and Hawaii, though the catalog does not yet include every introduced species there. A species listed here may not occur in your county; a gap in the records does not mean it is absent.