Castilla elastica (Nahuatl) word for rubber was "ulli / olli", from which their word for the ballgame derived), and also their name for the ancient people they associated with the origin of the ballgame, the Olmecs ("olmeca": "rubber people"). The Nahuatl word for the tree of "Castilla elastica" is olicuáhuitl; in Spanish it is known as palo de hule. Caucho, castilloa rubber. Castilla elastica Castilla elastica, the Panama rubber tree, is a tree native to the tropical areas of Mexico, Central America, and northern South America. It was the principal source of latex among the Mesoamerican peoples in pre-Columbian times. The latex
Ficus pumila milky sap of "Ficus pumila" can cause phytophotodermatitis, a potentially serious skin inflammation. Although the plant is not poisonous per se, "F. pumila" is listed in the FDA Database of Poisonous Plants. Ficus pumila Ficus pumila (creeping fig or climbing fig) is a species of flowering plant in the mulberry family, native to East Asia (China, Japan, Vietnam) and naturalized in parts of the southeastern and south-central United States. It is also found in cultivation as a houseplant. The etymology of the species name corresponds to the Latin word "pumilus" meaning "dwarf", and refers to the very small leaves of