Ferocactus echidne, from central Mexico, is a generally solitary species with a large but low globose stem. It is readily recognized because of its short spines and sparse tubercles, making it one of the few barrel cacti that appear naked and mostly defenseless. Its flowers are yellow. Surprisingly, given the few spines and its native habitat, it is able to take all the frosts that Tucson has thrown at it in recent years, including 15F. These plants are seedlings in 5-inch pots.