Ficus elastica is the tree which produces Rambong or Assam rubber.
Piper and Ficus, since the number of cosmopolitan or very widely distributed species is comparatively few, a geographical grouping is found specially convenient by those who are constantly receiving parcels of plants from known foreign sources.
The jagaey (Ficus sp.), which stifles in its giant coils the greatest trees of the forest, and the copei (Clusia rosea) are remarkable parasitic lianas.
" Rambong " or Assam rubber is the produce of Ficus elastica, commonly known as the indiarubber tree and cultivated in Europe as an ornamental plant.
In Assam and in upper Burma there are extensive forests of Ficus elastica, but to a large extent the trees have been damaged by careless tapping.