Pfeiffera is a small genus of cacti in the family Cactaceae, order Caryophyllales, placed within the tribe Echinocereeae. The genus is native to Bolivia and northwest Argentina, where species grow in humid montane and cloud-forest habitats — a lifestyle unusual for cacti, as members are epiphytic or lithophytic, clinging to trees or mossy rocks rather than rooting in dry ground.
The genus was first formally described in 1845 in Cact. Hort. Dyck. and named in honour of Ludwig Karl Georg Pfeiffer (1805–1877), a German physician, botanist and prolific conchologist who made significant contributions to cactus taxonomy in the nineteenth century.
Circumscription of Pfeiffera has been a subject of ongoing debate among botanists. Some authorities have treated several of its species as belonging to the closely related genus Lepismium, resulting in differing species counts across taxonomic databases. GBIF currently recognises six accepted taxa within the genus. The three species represented in cultivation and collections include Pfeiffera ianthothele, Pfeiffera monacantha, and Pfeiffera boliviana.
Etymology
The genus name Pfeiffera honours Ludwig Karl Georg Pfeiffer (1805–1877), a German physician, botanist and conchologist who contributed extensively to nineteenth-century cactus taxonomy. The name was established when the genus was first described in Cact. Hort. Dyck. in 1845.
Distribution
Pfeiffera is native to Bolivia and northwest Argentina, occurring primarily in humid montane and cloud-forest zones where species grow as epiphytes or lithophytes on trees and mossy substrates.
Taxonomy Notes
The circumscription of Pfeiffera has been debated, with some taxonomic treatments placing certain species within the related genus Lepismium (also in tribe Echinocereeae, Cactaceae). GBIF accepts Pfeiffera as a distinct genus with six descendants; iNaturalist links the genus to Lepismium in its Wikipedia reference, reflecting the unresolved boundary between these taxa.
