Botanical Description.--The mangosteen grows only in the southern islands of the Archipelago and its delicious fruit is the part of the plant known in Manila. The peel is at the present time almost universally employed in medicine. The fruit is about the size of a small Manila orange, the pericarp a dark red or chocolate color, tough and thick, crowned with the remains of the calyx. On breaking it open the edible portion of the fruit is seen, consisting of 6-18 seeds covered by a white, sweet pulp, cottony in appearance, of a delicious slightly acrid flavor. 1. _Garcinia venulosa_, Choisy. (_Cambogia venulosa_, Blanco.) 2. _G. Cambogia_, Desrouss. (_Cambogia binucao_, Blanco.) Nom. Vulg.--_Binukaw_, Tag., applied to both trees, though the first is also called _Gatasan pulá_ in Tagalo and _Taklang-anak_ in Pampango. Uses.--The fruit of the second species, the true name of which is _binucaw_, is acid and edible. The fruit and the trunk of both species, when cut, exude a gum-resin very much like gamboge which is obtained from the _G. morella_ or _G. pedicellata_, Desr. These gum-resins, however, seem to be much inferior to gamboge; they contain an essential oil which does not exist in the latter and their color is paler. Botanical Description.--The _G. venulosa_ is a tree with leaves opposite, lanceolate, acute, entire and glabrous, the inferior surface covered with nervelets which converge at the apex. Petioles short and flattened. Flowers tetramerous. Calyx, 4 persistent sepals. Corolla, 4 petals, overlapping, fleshy, ovate, of the same color as the calyx. Stamens numerous; no filaments; anthers round and very small. Style very short and thick, stigma peltate, divided into 10 parts. Fruit globose, depressed, no well-marked ridges when ripe. _G. Cambogia_ differs from the foregoing in the leaves which present no nervelets on the lower surface and the fruit which presents 8 angles or rounded ridges. Habitat.--Very common throughout the islands, abounding in the mountains of San Mateo and Morong. Blooms in August. _Garcinia morella_, Desr. Nom. Vulg.--I do not know the name given by the Filipinos to this tree, which Vidal and Soler have seen in Montalván, Tiwi (Albay) and San Mateo (Province of Manila); but it is highly important in medicine as the true gamboge is obtained from it. _Gamboge Tree_, Eng. The Gamboge of the U. S. P. and B. P. is obtained from _G. Hanburii_ which differs somewhat botanically from _G. morella_.