Origin and Habitat: Bolivia (Santa Cruz, Tarija, Chuquisaca) and (maybe) Paraguay.
Altitude: 600-1800 metres above sea level.
Habitat: This species grows in many habitat types, such as grasslands, shrublands, and forests.

Scientific classification
Kingdom:Plantae
(unranked):Angiosperms
(unranked):Eudicots
(unranked):Core eudicots
Order:Caryophyllales
Family:Cactaceae
Subfamily:Cactoideae
Tribe:Trichocereeae
Genus:Echinopsis
Species:E. subdenudata

From my collection

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