Echinopsis chamaecereus (Peanut Cactus)
Synonyms include "Cereus silvestrii, Echinopsis silvestrii, Chamaecereus silvestrii, Lobivia silvestrii.
It is native to the Tucuman region of Argentina.
This was part of the private collection of cacti and succulents at Manor Nursery, Angmering, West Sussex. The collection was started in 1948. The nursery is now gone. The collection has been dispersed to various new locations.