Oreocereus trollii Kupper a.k.a. the Old Man of the Andes is a s shrubby columnar cactus with fine, completely enveloping hair and powerful coloured spination, but much dwarfer in stature than Oreocereus celsianus. Young plants of Oreocereus trollii are also very popular in small cacti collections.Habit: It branches at the base and forms clumps of short chunky columnar shoots that can lay sideways with time. In young plants the shoots are like thick spheres and difficult to recognise as belonging to an Oreocereus.
;
Its name means "mountain cereus", formed from the Greek prefix oreo- (ὀρεο-, mountain) and the Neo-Latin cereus, meaning wax or torch.
;
Oreocereus trollii
Oreocereus trollii is ca. 15 cm tall and comes in a ø 9 cm pot.