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
Latin word order "five ships were burnt" but "no fewer than five ships were burnt". The use of hyperbaton (separation of words which normally go together) is also worth observing. Thus Caesar's "hae permanserunt aquae dies complures", with "hae" separated from "aquae" and "complures" at the end of the sentence, doesn't mean "These floods remained for several days" but "This time the flood waters, unlike the previous ones, remained for several days". In the past hundred years, but especially since the advent of computerised texts, Latin word order has been extensively studied, with a view to elucidating the principles on which it is