Herbarium records were studied to infer the introduction history and spread of the exotic Eurasian sickleweed (Falcaria vulgaris Bernh.) in the United States. The spread of the plant was reconstructed using the location of early collections as the possible sites of primary introduction, and the location of subsequent collections as potential pathways along which this species spread. Herbarium records indicate that sickleweed was first introduced no later than 1922, and independent introduction of this plant took place in the East Coast and in the Midwest of the United States. The species has spread to 37 counties of 15 states of the United States. No recent sickleweed record has been reported for the last 17 years in the U.S. except Iowa, Nebraska and South Dakota. The plant has been characterized as an aggressive weed by experts in the latter two states, where it is already well established and has infested the Fort Pierre National Grassland and Buffalo Gap National Grassland in South Dakota, and is reported from several sites along Nebraska roadsides. It is essential to verify the existence of sickleweed in the areas from where the herbarium specimens were previously collected to help identify the areas at risk. Control strategies need to be implemented and policy should be developed to establish the participation of public lands managers, transportation departments and private land-owners to control and manage this species before it becomes a more widespread invader.