a) Ficus elastica, a tropical tree used as a houseplant native to Asia.<ref name="Illustr. Oxford 1998">The Illustrated Oxford Dictionary, Oxford University Press, 1998</ref><ref>Botanica. The Illustrated AZ of over 10000 garden plants and how to cultivate them, Könemann, 2004</ref>
b) A tree which can produce latex, a rubber tree, including Hevea brasiliensis.<ref name="Illustr. Oxford 1998"/>
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