The invasive aquatic plants Ludwigia hexapetala (primrose-willow), L. grandiflora and L. peploides ssp. montevidensis (floating primrose-willow) have environmental, economic and social impacts, described in greater detail below. The California Invasive Plant Council Inventory Review Committee has given an "A" rating to these species with respect to environmental impact, the highest score possible. Economic impacts are measured in part by the millions of dollars spent in California on Ludwigia management in projects ranging from annual maintenance in the Potter Valley Irrigation District, Mendocino County to massive suppression efforts in the Laguna de Santa Rosa, Sonoma County. Social impacts include displacement of traditional-use species, aesthetic modification in riparian areas frequented by outdoor enthusiasts and obstruction of mosquito abatement efforts.