Professor Dubard, of the French National Museum and Colonial Garden, studied these trees botanically and classified them as C. Gallienii, C. Bonnieri, C. Mogeneti, and C. Augagneuri. The beans of berries from these trees were analyzed by Professor Bertrand and pronounced caffein-free; but Labroy, in writing of the same coffee, states that, while the bean is caffein-free, it contains a very bitter substance, cafamarine, which makes the infusion unfit for use. Dr. O.W. Willcox, in examining some specimens of wild coffee from Madagascar, found that the bean was not caffein-free; and though the caffein content was low, it was no lower than in some of the Porto Rican varieties.
Another source reports that Hanausek found no caffein in C. mauritiana, C. humboltiana, C. Gallienii, C. Bonnerii, and C. Mogeneti.