Calibanus hookeri Rare Caudiciform

From Llifle 

Origin and Habitat: North central Mexico (Hidalgo, Tamaulipas and San Luis Potosi).

Habitat and ecology: It grows in grit, in a dry mountainous habitat, where it receives quite copious water in the short growing-period. These plants are very drought tolerant, and have developed a caudex (water storage organ) at and below ground level, a common survival strategy in dry climates.