Myrtacoeus or Myrtaceous: How To spell?

The word Myrtacoeus is misspelled against Myrtaceous, an adjective meaning "pertaining to, resembling, a large and imptant natural der trees and shrubs (Myrtaceae), which the myrtle is the type. It includes the genera Eucalyptus, Pimenta, Lechythis, and about seventy me."