Noun
trees and shrubs yielding a fragrant oil
Source: WordNetThe APG III system agrees with the older Cronquist circumscriptions of treating Psiloxylaceae and Heteropyxidaceae within Myrtaceae, and Memecyclaceae within Melastomataceae. Source: Internet
Other Myrtaceae species might have more resistance than the guava, although that's still an area of active research. Source: Internet