Eighteen category one invasive species as defined by the Florida Exotic Pest Plant Council and nine category two invasive species are newly recorded for St. Lucie County, Florida as the result of surveys done by the authors from August through November 2003. These records document the rapid spread and need for increased monitoring of invasive species and the documentation of these specimens through the collection of herbarium voucher specimens. These records also highlight the gaps present in specimen vouchers in areas such as St. Lucie County due to a lack of monitoring.