Arrojadoa aureispina. Hardy to 35°F. Tropical cactus, protect fom frost. Full sun to part shade. Columnar brancing at the base, up to 6' tall. Regular water summer, little water in winter. Pink to lavendar flowers. Origin:  Brazil.

Arrojadoa horstiana.

Arrojadoa marylanae

Arrojadoa reflexa. USDA 10. Protect from frost. Full sun to part shade. Shrubby cactus, branching at the base, up to 6.5' tall. Regular water summer, little water in winter. Purple flowers. Origin: Brazil.   

Arrojadoa rhodantha. 

Arrojadoa rhodantha v. occibahiensis.