Haageocereus chrysacranthus is a columnar cactus with many ribs and fine needlelike spines.
Haageocereus chrysacranthus. See more pictures of cacti.
Plenty of food and drink, if it does not kill the plant with indigestion, will produce a fatter looking cactus with more ribs. Give it bright light, heavy soil with excellent drainage, cool to house temperatures and good air circulation.
Since it is rather slow growing on its own roots, it is sometimes grafted on the roots of a more vigorous cousin.
Caring for your cactus: