Echinopsis eyriesii
Sea-urchin cactus, Easter lily cactus
Thanks to Cacti & Succulents Identification Facebook Group for ID
Scientific classification
Kingdom: Plantae
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Cactaceae
Subfamily: Cactoideae
Genus: Echinopsis
Species: E. eyriesii
Its original habitat is Southern Brazil, Uruguay, and province of Entre Ríos Province, Argentina. It grows in grassy plains or in low hills in lowland up to 1.000 metres above sea level. The climate is tropical, continental. Winters are completely dry, while in summer the landscape is flooded by torrential rain and soaked with water. Rainfall up to 1500 mm by year.
– Wikipedia.