Pitahaya. — Very common cactus, which adheres to the trunk and branches of trees. It produces beautiful flowers and a round fruit the size of an orange, which when ripe takes on a red color, its interior being a white, grayish pulp, dotted with black seeds, very similar to the prickly pear, or fruit of the white prickly pear. . Casas describes the pitahaya in the following terms: “The shell is red on the outside and has certain not good thorns in it; the inside is almost like that of a ripe breva , with some very black granites like those of the paharies figs of Castile , and of the breva making ; something is tasty and fresh. The tree in which it is born are some long pencas and of the nature of the çabila de Castilla. . . And one of the pitahaya stalks comes out of the ground and perches on other trees, and spreads through them, looking like snakes, and from this a few other stalks come out, and all of them are full of thorns. "