Lophophora
At first glance: a cactus without spines. That is why the unobtrusive observer means recognizing a living stone. This is less obvious: all members of this genus contain alkaloids, and thus have a strong intoxicating effect. In german the plants are called Schnapsnase, Peotle or Peotl. In Mexico Lophophora is used for shamanic rituals.
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