English ethnobotanist Richard Spruce describes the use of the ayahuasca vine, which he names Banisteria caapi, by the Tukanoan Indian tribes in Brazil and Colombia. He observes a caapi ritual and imbibes a small amount of ayahuasca tea. Spruce wrote: "This is all I have seen and learnt of caapi or ayahuasca.... Some traveller who may follow my steps with greater resources at his command will, it is hoped, be able to bring away materials adequate for the complete analysis of this curious plant" (Spruce 1908, 1873).