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Triangle Cactus is a columnar cactus that reaches a peak of 2–7 m. The stems are darkish green, have three to 5 angles, and are three inches in diameter. The areoles are gray and separated by 2–3 cm. Central areoles have one to two spines up to four cm long. Radial areoles have 6 to eight spines up to 1-inch in length. The vegetation is up to eight inches in diameter with a tube up to 8–15 cm inches in length. Outer petals are greenish-white, internal tepals are pure white and pistils are creamy white. The shiny, purple fruits are round and two inches long.