Eusideroxylon

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''Eusideroxylon'' is a genus of evergreen trees of the family Lauraceae. The genus is monotypic, and includes one accepted species, ''Eusideroxylon zwageri''. It is known colloquially in English as Bornean ironwood, billian, or ulin.

It is native to Borneo and Sumatra, where it grows in lowland rain forests.

''Eusideroxylon'' are hardwood trees reaching up to 50 metres in height with trunks over in diameter, producing commercially valuable timber. The wood of ''E. zwageri'' is impervious to termites, and can last up to 100 years after being cut. Due to extensive logging, it is listed as vulnerable in the IUCN Red List. Provided by Wikipedia