Opuntia leucotricha, with the common names: arborescent prickly pear, Aaron's beard cactus, and semaphore cactus; and (in Spanish) Duraznillo blanco and Nopal blanco. 
It is a species of Opuntia (prickly pear) that is endemic to Mexico. The cactus occurs in mountain habitats, in the states of: San Luis Potosí, Tamaulipas, Zacatecas, Guanajuato, and Querétaro.
Opuntia leucotricha is a tree-like cactus, growing up to 5 metres (16 ft) tall. The platyclades have a thin fuzz of white hairs on their joints.
The plant is an invasive species in Florida.