Hesperoyucca newberryi is a plant species endemic to Arizona. It is found only in Mohave and Coconino Counties, on the walls of canyons near the Colorado River. Hesperoyucca newberryi, the Grand Canyon Quixote plant or Newberry's yucca is a perennial forming a rosette. It is semelparous (flowering once then dying). Leaves are narrow, up to 60 cm long but usually less than 3 cm across. Flowering stalks are up to 160 cm tall, bearing cream-colored flowers. Fruit is a dry, egg-shaped capsule about 4 cm long.