Eucalypt

Eucalypt is a descriptive name for woody plants with capsule fruiting bodies belonging to seven closely related genera found across Australasia: Eucalyptus, Corymbia, Angophora, , Allosyncarpia, Eucalyptopsis and Arillastrum.

For an example of changing historical perspectives, in 1991, largely genetic evidence indicated that some prominent Eucalyptus species were actually more closely related to Angophora than to other eucalypts; they were accordingly split off into the new genus Corymbia.

Although separate, all of these genera and their species are allied and it remains the standard to refer to the members of all seven genera Angophora, Corymbia, Eucalyptus, Stockwellia, Allosyncarpia, Eucalyptopsis and Arillastrum as "eucalypts" or as the eucalypt group.

The extant genera Stockwellia, Allosyncarpia, Eucalyptopsis and Arillastrum comprise six known species, restricted to monsoon forests and rainforests in north-eastern Australia, Arnhem Land plateau, New Guinea, the Moluccas and New Caledonia. These genera are recognised as having evolved from ancient lineages of the Myrtaceae family. According to genetic, fossil and morphological evidence, it is hypothesised that they evolved into separate taxa before the evolution of the more widespread and well-known Eucalyptus, Corymbia and Angophora genera, and all of their many species.

Eucalyptus deglupta has naturally spread the furthest from its Eucalyptus genus Australian geographic origins, as the only species known growing naturally in the nearby northern hemisphere, from New Guinea to New Britain, Sulawesi, Seram Island to Mindanao, Philippines.Eucalyptus urophylla also grows naturally as far west as the Flores and Timor islands.

...
Wikipedia