||Oncidium cebolleta also known as Oncidium longifolium is an orchid that is native to the stony cliffs of Tarahumara Indian country of Mexico (Chihuahua). It is suspected to be a hallucinogen, used by the Tarahumara as a temporary replacement when Peyote (Hikuri) is not available. Little is known of it's traditional use.|
It has been found to contain phenanthrene alkaloids of unknown pharmacology. Morphine and codeine are both phenanthrene derivatives, although this does not suggest that the action of O. cebolleta would be similar to that of an opiate.
This was all I was able to find except one reference about O. cebolleta which follows :
F.R.Stermitz, T.R.Suess, C.K.Schauer, O.P.Anderson, and R.A.Bye, Jr., "New and Old Phenanthrene Derivatives from Oncidium cebolleta, A. Peyote-Replacement Plant", J. Nat. Prod., 46, 417-423 (1983).
Hope this helps.