Natural rubber at least showed promise as rubber sources, include the rubber fig ("Ficus elastica"), Panama rubber tree ("Castilla elastica"), various spurges ("Euphorbia" spp.), lettuce ("Lactuca" species), the related "Scorzonera tau-saghyz", various "Taraxacum" species, including common dandelion ("Taraxacum officinale") and Russian dandelion ("Taraxacum kok-saghyz"), and perhaps most importantly for its hypoallergenic properties, guayule ("Parthenium argentatum"). The term gum rubber is sometimes applied to the tree-obtained version of natural rubber in order to distinguish it from the synthetic version. The first use of rubber was by the indigenous cultures of Mesoamerica. The earliest archeological evidence of the use of natural latex from the
Ficus hispida it parasitizes the other fig wasp "Ceratosolen solmsi". The yet unnamed nematode species "Caenorhabditis sp. 35" has been found in Aceh, Indonesia, associated with the tree. Ficus hispida Ficus hispida is a small but well distributed species of tropical fig tree. It occurs in many parts of Asia and as far south east as Australia. There is a large variety of local common names. Like a number of ficus, the leaves are sandpapery to touch. An unusual feature is the figs which hang on long stems. In Australia the fruit are eaten by cassowaries and double-eyed fig parrots. Phayre's leaf