Banisteriopsis is a genus of approximately 65 species of flowering plants in the family Malpighiaceae, order Malpighiales. The genus ranges from northeastern Mexico and Cuba through Central and South America to northern Argentina, with the greatest diversity in Brazil, Bolivia, Colombia, Ecuador, and Peru.
Members of the genus are typically woody lianas (vines) that twine on other plants for support. The best-known species, Banisteriopsis caapi, can reach up to 30 metres in length and bears small pale white or pink flowers measuring 12–14 mm that bloom infrequently. Species in the genus contain beta-carboline alkaloids and polyphenols, compounds that have made Banisteriopsis ethnobotanically significant across South American cultures.
The genus is most widely known through Banisteriopsis caapi, the principal ingredient in ayahuasca — a psychoactive decoction with a long history of ceremonial and entheogenic use among Indigenous peoples of the Amazon rainforest. The plant holds the status of "plant teacher" in many Amazonian traditions. Use of the vine predates European contact by centuries; the first Western documentation comes from 16th-century Spanish and Portuguese missionaries, and the species was formally described by British botanist Richard Spruce in 1851.
The genus name honours John Banister, a 17th-century English clergyman and naturalist. An earlier genus name, Banisteria, is still occasionally encountered in older literature.
Etymology
The genus name Banisteriopsis honours John Banister (1650–1692), a 17th-century English clergyman and naturalist, according to Umberto Quattrocchi's CRC World Dictionary of Plant Names. The genus was previously known as Banisteria; the suffix -opsis (from Greek, meaning "resembling") was added in the modern genus name.
Distribution
Banisteriopsis ranges from northeastern Mexico and Cuba through Central America and tropical South America to northern Argentina. The centre of diversity lies in Brazil, Bolivia, Colombia, Ecuador, and Peru, where most of the approximately 65 accepted species occur. The genus is largely confined to Neotropical habitats.
Cultural Uses
Banisteriopsis caapi is the central ingredient of ayahuasca, a psychoactive decoction used for centuries in ceremonial and healing contexts by Indigenous peoples of the Amazon basin. Indigenous groups of the region regard the vine as a "plant teacher." Early European missionaries in the 16th century encountered and documented ayahuasca brews. Today, ayahuasca use extends into contemporary spiritual and therapeutic contexts globally. Legal status varies widely by country.
History
Banisteriopsis caapi was used by Indigenous South American peoples for hundreds, possibly thousands, of years before European contact. The first Western written records come from 16th-century Spanish and Portuguese explorers and missionaries who described ayahuasca brews. In 1851, British botanist Richard Spruce formally identified B. caapi as a new species after observing Guahibos people in Venezuela's Llanos region chewing the bark rather than brewing it as a drink. The genus was originally placed in Banisteria before being reclassified as Banisteriopsis.
Taxonomy Notes
The genus was formerly known as Banisteria; Banisteriopsis is the accepted name under modern taxonomy. Banisteriopsis caapi carries numerous synonyms including Banisteria caapi, Banisteria quitensis, Banisteriopsis inebrians, and Banisteriopsis quitensis. The family Malpighiaceae is a large pantropical family of flowering plants; Banisteriopsis sits within the order Malpighiales alongside willows, violets, and passion-flowers.
