grows over a relatively small area of central Arizona, at the upper reaches of the Sonoran Desert; it may be seen in such locations as the Superstition Mountains
east of Phoenix and the east section
of Saguaro National Park near Tucson. Leaves are greyish green or bluish green in color, convex underneath and strongly concave on top, edged by small teeth between half and just over one inch apart. Leaves narrow to a sharp, brownish, grooved spine. Mature plants form a rosette 5 feet wide, and when blooming produce a very tall stalk bearing clusters of brilliant yellow flowers.