Phylogeny, morphology and circumscription of Myrcia sect. Sympodiomyrcia (Myrcia s.l., Myrtaceae)

Autor(es)

Santos, Matheus F. ; Sano, Paulo T. ; Forest, Felix ; Lucas, Eve

• Tipo de documento: Artigo Científico
• Fonte: Taxon; v. 65, n. 4, p. 759-774, AUG 2016.
• Citações Web of Science: 13

Resumo

Myrcia s.l. comprises ca. 780 species distributed in nine numbered, informal monophyletic groups. The aims of this work are to improve the phylogenetic and morphological knowledge of one of these clades. The phylogenetic analyses included 24 of the 29 inferred species of ``clade 7{''}, plus 80 samples of other clades of Myrcia s.l. and outgroup taxa. Bayesian and maximum likelihood analyses were conducted using the markers ITS, ndhF, psbA-trnH, trnL-trnF and trnQ-rps16. The morphological study employed a maximum-parsimony algorithm to reconstruct the evolution of selected characters on the Bayesian topology. Myrcia sect. Sympodiomyrcia ({''}clade 7{''}) is formally described and 28 species are assigned to the group. The new section is defined by the presence of cataphylls, an inflorescence with sympodial basal branching and opposite apical branching, a hypanthium elongated above the ovary and not tearing during anthesis, and calyx lobes free and deciduous. Statistical support for internal relationships is low and there is little congruence with morphology or geographical distribution. A Glade corresponding to Calyptranthes appears to be the sister group of Myrcia sect. Sympodiomyrcia and sympodial branching (in vegetative and basal inflorescence branches), presence of cataphylls and deciduous calyx lobes are putative synapomorphies of this Glade. Exclusive to Calyptranthes is the calyx with completely fused lobes. Results increase systematic understanding in the large genus Myrcia s.l. but highlight the need for further phylogenetic and morphological studies. (AU)

• Processo FAPESP: 10/09473-0 - Revisão, filogenia e biogeografia do clado Myrcia pulchra Group (Myrcia s.l., Myrtaceae)
• Beneficiário: Matheus Fortes Santos
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 12/14914-1 - Sistemática do clado "pulchra" (Myrcia S.L., Myrtaceae): análises filogenéticas, biogeográficas e revisão nomenclatural
• Beneficiário: Matheus Fortes Santos
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado