Etymology - From the Latin "pygmaeus" meaning dwarf, hence "dwarf cereus".
The genus Pygmaeocereus features small, cylindrical stems that form clumps. The stems have shallow, tuberculate ribs with many spines that are spreading and not fierce. Flowers are nocturnal, white and open on the end of long, thin floral tubes that have scales and are hairy.
In habitat, this genus is restricted to Peru - particularly in the fog zone along the coast. In cultivation, the species is grown among more serious cactus collectors, but not grown commercially.