tetrapterys styloptera tetrapterys styloptera tetrapterys styloptera (syn. tetrapterys methystica and tetrapteris methystica) is a psychoactive plant native to the new world tropics, from panama to the amazon rainforest. despite limited analytic information, its alkaloids are believed to be similar to ones from banisteriopsis caapi which contains harmala alkaloids and maois. more recently, the vine has been exported from peru as "grey ayahuasca". tetrapterys styloptera scientific classification kingdom: plantae clade: tracheophytes clade: angiosperms clade: eudicots clade: rosids order: malpighiales family: malpighiaceae genus: tetrapterys species: t. styloptera binomial name tetrapterys stylopteraa.juss. synonyms bunchosia squarrosa griseb. tetrapterys boliviensis nied. tetrapterys boliviensis var. granatensis nied. tetrapterys methystica r.e.schult. tetrapterys reticulata small tetrapterys squarrosa (griseb.) griseb. tetrapterys tenuistachys rusby tetrapterys styloptera seedling legality tetrapterys methystica is cited in louisiana state act 159.