Oreocereus

Oreocereus leucotrichus is a small shrubby columnar cactus, forming dense broad clumps covered in spines. It is a much variable species.

Oreocereus trollii a.k.a. the Old Man of the Andes is a s shrubby columnar cactus with fine, completely enveloping hair and powerful amber-yellow spination. Young plants of Oreocereus trollii are also very popular in small cacti collections.