Systematic analysis of Dendrobium Swartz section Dendrocoryne in the Australian region |
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Authors: | P B Adams J M Burke S D Lawson |
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Institution: | (1) School of Botany, The University of Melbourne, Victoria, Australia, 3010 |
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Abstract: | Dendrobium sect. Dendrocoryne is a difficult taxonomic group of allied species and species complexes, occurring on the eastern Australian coastline, Lord
Howe Island and New Caledonia. Significant morphological characters were assessed from all key areas of the distribution range.
Patterns of variation between species, varieties and hybrids were investigated by principal coordinate analysis. The analyses
affirm 12 species in the sect. Dendrocoryne described by Schlechter (1912, 1982) and Dockrill (1969, 1992), including a cluster of small statured D. gracilicaule, D. adae, D. fleckeri, and D. finniganense, and three variable species complexes – D. speciosum, D. kingianum and D. tetragonum. Recently described D. finniganense and D. callitrophilum are interpreted as members of the section. Phylogenetic relationships are presented based on parsimony analysis of 31 morphological
characters. Analyses do not support proposals to recognize new genera for D. tetragonum, D. callitrophilum and D. aemulum, or to create new species within D. tetragonum, D. jonesii, D. speciosum and D. kingianum. The phylogeny indicates that rainforest taxa are earlier lineages and xerophytic taxa are more derived. |
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Keywords: | Dendrobium Orchidaceae Dendrocoryne species complex Australian region phylogeny morphology |
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