Yellow and Caucasian bluestems are introduced bunchgrass species that are becoming invasive in southwestern States after successfully invading the Central and Southern Great Plains. This field guide serves as the U.S. Forest Service’s recommendations for management of yellow and Caucasian bluestems in forests, woodlands, rangelands, desert, and desert scrub associated with its Southwestern Region. TheSouthwestern Region covers Arizona and New Mexico, which together have 11 national forests. The Region also administers 4 national grasslands located in northeastern New Mexico, western Oklahoma, and the Texas panhandle.