Pterocactus (from Greek pteron, "wing", referring to the saucer-shaped seed of these plants) is a genus of the cactus family (Cactaceae), comprising 9 species. All Pterocactus have tuberous roots and are endemic to South and Western Argentina. The genus has been given its own tribe, the Pterocacteae. A molecular phylogenetic analysis placed the genus in the tribe Tephrocacteae.
Species of the genus Pterocactus according to Plants of the World Online :