Eugenia koolauensis, commonly known as Ko?olau eugenia or nioi, is a species of flowering plant in the myrtle family,This is one of two Eugenia species native to Hawaii, and the only endemic It is a shrub or tree grows 2 to 7 meters tall. The tips of the branches and the undersides of the leaves are hairy. White flowers occur in the leaf axils
In cultivation, n?oi may begin flowering in late October and continuously throughout the year with perhaps a very slight break in September or early October.
However, n?oi may actually prove to be a year round bloomer and fruiter.