Pygmaeocereus is a small and unusual cactus genus native to Peru, known for its miniature columnar growth and delicate, often nocturnal flowers. The stems may grow singly or form small clusters, with fine spines and a textured surface that give the plant a distinctive appearance. Despite its columnar habit, Pygmaeocereus remains compact enough for container cultivation and specialist collections. Its small stature, unusual growth pattern and night-blooming flowers make it an interesting choice for enthusiasts who enjoy less commonly seen cactus genera.