Plate I. I, Desert vegetation at Arroyo Catavina, northern Baja California. 2, Cactus forest, Mexquititlan, Guerrero. 2. I, Humid tropical forest exterior, Santa Lucrecia, Veracruz. 2, Swamp forest, Contoy Island, Quintana roo. 3. 1, Forest interior near Apazote, Campeche. 2, Tree fern in partially cleared area, Jaltipan, Veracruz. I, Interior of marsh, Altamira, southern Tamaulipas. 2, Savanna area near Apazote, Campeche. I, Spanish cedar (cedrela mexicana).