A revised classification for the predominantly eastern Australian Eucalyptus subgenus Symphyomyrtus sections Maidenaria, Exsertaria, Latoangulatae and related smaller sections (Myrtaceae)

Dean Nicolle, Currency Creek Arboretum, Rebecca Jones
2018 Telopea  
A revised classification for the predominantly eastern Australian Eucalyptus subgenus Symphyomyrtus sections Maidenaria, Exsertaria, Latoangulatae and related smaller sections (Myrtaceae). Abstract A revised classification for Eucalyptus subgenus Symphyomyrtus sections Maidenaria, Exsertaria, Latoangulatae and five related smaller sections (Liberivalvae, Racemus, Incognitae, Similares and Pumilio) (herein referred to as 'MEL+5' lineage for convenience) is provided, based on evidence from a
more » ... t phylogenetic study of this group (Jones et al. 2016) and on observations and data from other sources, including our extensive field observations, study of herbarium collections, common garden trials and the findings of other phylogenetic studies. We recognise 153 species and 184 terminal taxa in the 'MEL+5' lineage, and classify this group into 6 sections, 23 series and 8 subseries. This new classification mainly involved the repositioning of various terminal taxa into existing higher-level taxonomic groups (sections, series and subseries), as we have attempted to achieve an accurate and useful classification while minimising taxonomic disruption of existing names. Nevertheless, nine new higher-level taxa (eight series and one subseries) are newly described. A full classification of the 'MEL+5' lineage is provided, which includes all terminal taxa, taxon authorships, type species, the natural distribution of recognised terminal taxa, and taxonomic and nomenclatural synonyms. the most recent informal classification of the eucalypts (Nicolle 2015), recognises three genera: Angophora (12 species), Corymbia (about 95 species) and Eucalyptus (about 730 species). Within Eucalyptus, Nicolle (2015) recognised eight subgenera, namely, the polytypic subgenera Eudesmia (25 species), Symphyomyrtus (about 470 species), and Eucalyptus (about 130 species), and the monotypic subgenera Acerosa (E. curtisii), Cruciformes (E. guilfoylei), Alveolata (E. microcorys), Cuboidea (E. tenuipes) and Idiogenes (E. cloeziana). This subgeneric classification largely follows Brooker (2000), the most recent formal classification of the eucalypts, although Brooker recognised a further two subgenera: E. subg. Minutifructus (five species), which was included in E. subg. Symphyomyrtus by Nicolle (2015), partly on the basis of Whittock et al. (2003), and the monotypic E. subg. Primitiva (E. rubiginosa), which was included in E. subg. Eucalyptus by Nicolle (2015) on the basis of their very similar morphology and previous molecular phylogenies, which indicate that E. rubiginosa is nested within E. subg. Eucalyptus (Steane et al. 2002; Ladiges et al. 2010). Within the genus Eucalyptus, the largest subgenus, Symphyomyrtus, consists of about 470 species belonging to eleven sections (Nicolle 2015). The sections are mostly well-differentiated using molecular markers (Pollock et al.
doi:10.7751/telopea12571 fatcat:2mnyaueivneqhhkvcz5bwicspm