Leuchtenbergia
 Leuchtenbergia principis (agave cactus or prism cactus) the sole species of the genus Leuchtenbergia is a species of cactus. It is native to north-central Mexico (San Luis Potosi Chihuahua). The genus is named after Maximilian Eugen Joseph (1817–1852) Duke of Leuchtenberg and amateur botanist.It is very slow-growing but can eventually grow up to 70 cm high with a cylindrical stem which becomes bare and corky at the base with age.