Lophophora diffusa in habitat in Querétaro.

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This is a northern population.

Despite their rough resemblence to Lophophora williamsii, Lophophora diffusa is known to not be hallucinogenic.
    L. williamsii possesses mescaline as its major alkaloid but the published analytical accounts of L. diffusa have shown them to contain either no mescaline or else only minute traces which are pharmacologically inactive.