This is an Echinopsis NOID hybrid. A large number of cactus genera formerly easily distinguishable in flower and with different growth forms have been lumped into the genus Echinopsis. This would have been known as Trichocereus. The stems are about 4"/10cm diameter and up to 5 feet/1.5 meters tall. They often spawl.
__________________ May the bridges I've burned light my way.