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Yeah it's a wishy washy world of nomenclature in the Cacti world...
Some say they are the same, some argue.
I'm really not too sure about the compounds to be honest.

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Yeah. Someone I know cooked a whole lot down to a nauseating green goo. All I got was stomach cramps.

Haha, you win some you loose some 🤣

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Echinopsis is the new world nomenclature of the genus. Trichocereus is still used though.

Not all trichocereus species contain mescaline. It's mainly contained within 3 species: bridgesii, peruvianus, and pachanoi. The alkaloid content is pretty variable between species and it's also dependent on weather, season and how much water they get.