Eucalyptus
There are over 700 species of eucalypts, and almost all of them are in Australia. Eucalypts can be found in almost every part of the Australia, and they are adapted to many different habitats. Their distribution has an implication: they must have evolved after Australia lost contact with the rest of Gondwana. Apart from the island of New Guinea, which is historically connected to Australia, and the Philippines, and a couple of small islands, the eucalypts are not naturally found in any other countries.