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
The Word for World Is Forest at interpreting dreams are seen as gods amongst the Athsheans. In the internal chronology of the Hainish universe, the events of "The Word for World is Forest" occur after "The Dispossessed", in which both the ansible and the League of Worlds are unrealised dreams. However, the novel is located prior to "Rocannon's World", in which Terran mindspeech is seen as a distinct possibility. A date of 2368 CE has been suggested by reviewers, although Le Guin provides no direct statement of the date. "The Word for World is Forest" begins from the point of view of Captain Davidson, who is