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 vasta not cultivated under domestication, and is disappearing due to human pressure, mainly in its use as firewood. Ficus vasta Ficus vasta (; warka) is a fig plant found in Ethiopia and Yemen. "Ficus vasta" is a large tree, with a massive trunk, and spreading branches whose tips form an inverted bowl up to 50m in diameter. It reaches a height of 25m. The trunk is smooth and grey, and is commonly buttressed. The bark is smooth and grey, except on young branches where it is yellow-white-brown, and flaking when dry. The leaves are elliptical, reaching 25 x 20 cm, hairy,