Xerophytes

The boojum tree is an unusual flowering tree endemic to the deserts of Baja California and a small area of Sonora, Mexico. It is covered with spiny twigs that bear yellowish flowers in hanging clusters. As with its relative the ocotillo, the small leaves appear after rainfall and are drought-deciduous, meaning they fall off during the dry season to limit water loss.

Cephalocereus senilis, the old man cactus, is a species of cactus native to Hidalgo and Veracruz in central Mexico. It is threatened in the wild, but widespread propagation and popularity in cultivation have reduced the demand on wild populations.