Ferocactus echidne f. monstorus

The monstrous shape of this cactus presents geometric anomalies, for example asymmetrical protuberances or absence of spines, different for each individual exemplar, so much so as to make each of them absolutely unique and for this reason extremely sought after by collectors. It is a peculiar medium-sized cacti, with a solitary posture. Its stem, initially globose, may take a columnar shape with the growth, and presents with deep and well marked ribs, on which, from the woolly areoles and distant from each other, come out radial amber thorns, long and thin; the central spines may vary from white to yellow-reddish. In late spring it produces beautiful funnel-shaped bright yellow flowers, which form a ring at the apex of the plant.