Echinopsis

Echinopsis
	Echinopsis oxygona
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Cactaceae
Subfamily:	Cactoideae
Tribe:	Cereeae
Subtribe:	Trichocereinae
Genus:	Echinopsis; Zucc.
Type species
	Echinopsis eyriesii, now Echinopsis oxygona;
Species
	See text.
Synonyms
	Acantholobivia Backeb. ; Andenea Kreuz. ; Aureilobivia Frič ex Kreuz., not validly publ. ; Chamaecereus Britton & Rose ; Cinnabarinea Frič ex F.Ritter ; Cosmantha Y.Itô ; × Cosmopsis Y.Itô ; Echinonyctanthus Lem. ; Furiolobivia Y.Itô ; Helianthocereus Backeb. ; Hymenorebulobivia Frič ex Kreuz., not validly publ. ; Hymenorebutia Frič ex Buining ; Lobivia Britton & Rose ; Lobiviopsis Frič ex Kreuz., not validly publ. ; Megalobivia Y.Itô, not validly publ. ; Mesechinopsis Y.Itô ; Neolobivia Y.Itô ; Pilopsis Y.Itô, not validly publ. ; Pseudolobivia (Backeb.) Backeb. ; Salpingolobivia Y.Itô ; × Salpingolobiviopsis Y.Itô ; Scoparebutia Frič & Kreuz. ex Buining ; Soehrensia Backeb. ; Trichocereus (A.Berger) Riccob. ;

Echinopsis is a genus of cacti native to South America, sometimes known as hedgehog cactus, sea-urchin cactus or Easter lily cactus. As of November 2025, Plants of the World Online used a broad circumscription of the genus, resulting in about 80 accepted species, ranging from large and treelike types to small globose cacti. The name derives from echinos hedgehog or sea urchin, and opsis appearance, a reference to these plants' dense coverings of spines.

They are remarkable for the great size, length of tube, and beauty of their flowers, borne upon generally small and dumpy stems.