View source for Myrtales

==Origins==
Myrtales is dated to around 89–99 million years ago (mya) in [[Australasian realm|Australasia]]; however, there is some contention as to that date, which was obtained using [[nuclear DNA]]. When looking at [[chloroplast DNA]], the myrtales' ancestor is, instead, considered to have evolved during the mid-Cretaceous period (100{{nbsp}}mya) in [[Southern Africa|Southeast Africa]], rather than in Australasia.<ref name="Grattapaglia">{{cite journal | vauthors = Grattapaglia D, Vaillancourt RE, Shepherd M, Thumma BR, Foley W, Külheim C, Potts BM, Myburg AA | title = Progress in Myrtaceae genetics and genomics: Eucalyptus as the pivotal genus. | journal = Tree Genetics & Genomes | date = June 2012 | volume = 8 | issue = 3 | pages = 463–508 | doi = 10.1007/s11295-012-0491-x | doi-access = free | hdl = 2263/58495 | hdl-access = free }}</ref> Although the APG system classifies myrtales as within the eurosids, the recently published genome of ''Eucalyptus grandis'' places the order myrtales as a sister to the eurosids rather than inside them. The discrepancy is thought to have arisen due to the difference between using numerous taxa versus using various genes for constructing a phylogeny.<ref name=Myburg/>