Cereus stenogonus is an arborescent cactus that grows to 8m tall. It has a short trunk and narrow crown with few branches.
The branches are:
The bark is:
The leaves are absent, instead there are 2–5 short spines per areole (whitish knots from which the spines protrude).
The plant has solitary flowers in January and February that:
The fruit is an elliptical berry 10cm long, orange-reddish when mature, with the long persistent style and white-pinkish flesh. They contain numerous small dark seeds.