Armatocereus rauhii ssp. balsasensis
Found in Camajarca and Amazonas, Peru , Armatocereus rauhii ssp. balsasensis is a branching tree like cactus to over 30 feet tall with stems 8 inches in diameter. The stems pinch between each seasons growth, giving it a segmented appearance. It produces red flowers an inch and a half across.
I got two of these from Home Depot. I took cuttings of one and potted the other. It will go in the garden someday.