As an adjective myrtaceous
is characteristic of the myrtle family (myrtaceae) of plants.
As a noun eugenia is
(botany) any member of the genus eugenia of myrtaceous plants.
eugenia
Proper noun
Hypernyms
* (genus) Plantae - kingdom; angiosperms, eudicots, core eudicots, rosids, eurosids II - clades; Myrtales - order; Myrtaceae - family; - tribe