Yucca angustissima Narrowleaf Yucca

Ethnobotany
"This spiky plant made life comfortable. Early peoples trod all over the Southwest in sandals made from yucca leaves and leaf fibers. They slept on yucca mats under roofs lashed together with yucca ropes. Pounded yucca root was their source of soap and shampoo, which Navajo say makes your hair long, black, and shiny." Source Wupatki National Monument Sign

seen at Wupatki National Monument, Arizona, USA