'''''Trichocereus macrogonus'' var. ''pachanoi''''' (syn.[[Synonym (taxonomy)|synonyms including '''''Trichocereus pachanoi''''' and '''''Echinopsis pachanoi''''') is a fast-growing columnar [[cactus]] found in the [[Andes]] at {{convert|2000|–|3000|m|abbr=on}} in altitude.<ref name="Rätsch">{{cite book |last=Rätsch |first=Christian |author-link=Christian Rätsch |title=Enzyklopädie der psychoaktiven Pflanzen. Botanik, Ethnopharmakologie und Anwendungen |publisher=AT-Verlag |location=Aarau |year=2002 |page=15 |isbn=978-3-85502-570-1 }}</ref>{{sfn|Anderson|2001|p=276}} It is one of a number of kinds of cacti known as San Pedro cactus. It is native to [[Ecuador]] and [[Peru]],<ref name=POWO_77125731-1>{{Cite POWO|title=''Trichocereus macrogonus'' var. ''pachanoi'' (Britton & Rose) Albesiano & R.Kiesling|id=77125731-1|access-date=2023-09-25|mode=cs1}}</ref> but also found in [[Argentina]], [[Bolivia]], [[Colombia]], [[Chile]] and [[Venezuela]] and cultivated in other parts of the world.<ref name="erowid">{{citation |url=http://www.erowid.org/plants/cacti/cacti_guide/cacti_guide_trichoce.shtml |title=Visionary Cactus Guide |publisher=Erowid.org |access-date=2012-10-24}}</ref><ref>{{Cite web|last=Mchem|first=Benjamin Bury|date=2021-08-02|title=Could Synthetic Mescaline Protect Declining Peyote Populations?|url=https://chacruna.net/synthetic_mescaline_protect_declining_peyote_populations/|url-status=live|access-date=2021-09-21|website=Chacruna|language=en-US|archive-url=https://web.archive.org/web/20210802174233/https://chacruna.net/synthetic_mescaline_protect_declining_peyote_populations/ |archive-date=2021-08-02 }}</ref> Uses for it include traditional medicine and traditional veterinary medicine, and it is widely grown as an ornamental cactus. It has been used for healing and religious divination in the Andes Mountains region for over 3,000 years.<ref>{{cite book |author1=Bigwood, Jeremy |author2=Stafford, Peter J. |title=Psychedelics encyclopedia |publisher=Ronin Pub |location=Berkeley, CA |year=1992 |pages=118–9 |isbn=978-0-914171-51-5
