The plants listed in this field guide are nuisance weeds, those that are troublesome, but have not been listed by the state as noxious weeds. Similar to noxious weeds, nuisance weeds can spread rapidly and compete aggressively with desirable plants for light, nutrients and water. The purpose of this book is to help homeowners, land managers, green-industry personnel, agricultural producers and recreationists to identify nuisance weeds of Nevada. The over 60 weeds listed in this field guide were selected with input from Extension educators in Nevada counties, other University of Nevada Cooperative Extension personnel and local weed control groups. See also: Extension Publications for more resources.