The early history of those first
S. divinorum plants in the US is rather interesting. Since they first appeared in cultivation in the US right around the time that Wasson and Hofmann received viable type specimens in Oaxaca and sent them to Carl Epling for identification, everyone assumed that the plants were propagated from Wasson and Hofmann's samples. The strain has even been called the Wasson and Hofmann strain. In fact, Wasson and Hofmann sent only dried specimens of the plant, no live ones. But at virtually the same time, a psychiatrist named Sterling Bunnell was in Oaxaca to collect cultures of psilocybian mushrooms, and at the same time happened to collect an
S. divinorum plant, which he brought home and raised in his garden. A few months later, he saw Wasson and Epling's articles in the Harvard Botanical Museum Leaflets, and donated a cutting to the UCLA botanical gardens as well as giving a cutting to Dr. Shulgin and others involved in the exploration of psychoactives.
Despite having the plant since the early 1960s, Shulgin apparently tried the plant only once, and didn't experience any effects on that occasion... he was always too busy with bioassaying other psychoactives of his own devising to become interested enough in followup experiments. He finally tried the plant for a second time in 1998, at the Salvia conference held at the Breitenbush Hotsprings.