Rivea corymbosa (common synonym: Turbina corymbosa) belongs to the group of Morning glory plants. The seeds contain lysergic acid which generates a powerful psychedelic experience.
The traditional method of preparation is to soak the finely ground or chewed seeds in half a cup of water for several hours, then consuming both the water and seeds.
The traditional dose consists of 14 to 22 seeds (R. Gordon Wasson, 'Ololiuqui and the other hallucinogens of Mexico' in 'Homenaje a Roberto J. Weitlaner', 1971).
To reduce nausea, one may let the seeds sprout by keeping them moist for 3 or 4 days (regularly replacing the water), discarding the outer shells and eating only the inner white material.