A new field guide covering invasive plants in the southeastern U.S., entitled "New Invaders of the Southeast", is now available for a free download.  This book covers non-native plants that may not yet be widespread in the region, but are still important enough so that people should be aware of them.  The book covers basic identification and biology, as well as known distribution and some of the regulatory issues.  There are also guides to new invaders of the northeast, northwest, and southwest, all freely available.