''Myrtastrum'' is a genus of plants in the Myrtaceae first described as a genus in 1941. It contains only one known species, ''Myrtastrum rufopunctatum'',

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to New Caledonia.Kew World Checklist of Selected Plant Families
/ref> It is a phylogenetically isolated genus within the tribe Myrteae.Vasconcelos, Thais N.C., Carol E.B. Proença, Berhaman Ahmad, Daniel S. Aguilar, Reinaldo Aguilar, Bruno S. Amorim, Keron Campbell, et al. (2017) Myrteae Phylogeny, Calibration, Biogeography and Diversification Patterns: Increased Understanding in the Most Species Rich Tribe of Myrtaceae.” Molecular Phylogenetics and Evolution 109: 113–37. .

References

Myrtaceae Endemic flora of New Caledonia Monotypic Myrtaceae genera Taxa named by Adolphe-Théodore Brongniart Taxa named by Jean Armand Isidore Pancher Taxa named by Jean Antoine Arthur Gris Taxa named by Max Burret {{Myrtaceae-stub