Leaves of yucca torreyi
are bluish or yellowish green in color, long (up to 55 inches), quite rigid, topped by a sharp spine and strongly curved in cross-section. They may be lined by a small number of curly filaments, towards the plant center. Old specimens grow tall (up to 20 feet), the rosettes supported by a woody stem which is covered by a thick blanket of dead leaves, and they branch quite readily.
Torrey's yucca is one of several similar, tree-like yuccas of the Chihuahuan Desert; others include yucca faxoniana
(whose leaves are slightly wider, longer, thicker and greener), yucca elata
which has much thinner, narrower leaves and yucca thompsoniana
, another narrow-leaved species. Some authorities consider yucca torreyi to be a synonym of yucca treculeana