Centroglossa tripollinica (Barb. Rodr.) Barb. Rodr. (Orchidaceae: Oncidiinae): lectotypification and rediscovery in the State of Paraná, Brazil

The Ornithocephalus clade comprises small epiphytes distributed in 12 genera and c. 120 species. Their flowers have complex structures, the homologies of which are difficult to interpret. Through ontogenetic studies, we identified the origins of the tabula infrastigmatica, floral appendages located in the gynostemium and the labellar callus. Using a scanning electron microscope (SEM), we analysed flowers at various developmental stages from representatives of three genera: Ornithocephalus (two species), Phymatidium (two species) and Zygostates (three species). The tabula infrastigmatica of Phymatidium results from the fusion of the lateral carpels and staminodes, with different degrees of synorganization across species and can be considered a plesiomorphic characteristic within the clade. Contradicting hypotheses of a staminodial origin, the auricles present in this genus derive from the gynostemium. In Zygostates, the lateral appendices derive from staminodes and can show different development degrees, whereas in Ornithocephaus that character has been lost. We corroborate the view that the labellum is a single organ derived from the median petal and the labellar callus is derived from it.

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Floral development of theOrnithocephalusclade (Oncidiinae, Orchidaceae): the origin of the tabula infrastigmatica, gynostemium appendices and labellar callus

Royer

Brito

Stützel

et al. 2020

Botanical Journal of the Linnean Society

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Phylogenetic Position ofCentroglossaandDunstervillea(OrnithocephalusClade: Oncidiinae: Orchidaceae) Based on Molecular and Morphological Data

Royer¹,

Brito

Mauad

et al. 2022

Systematic Botany

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Abstract— Even though the monophyly of the Ornithocephalus clade (Oncidiinae) is currently well defined, the systematic positioning of Centroglossa and Dunstervillea remains obscure in the clade due to the absence in previous phylogenetic studies. Centroglossa has a very similar habit and is indistinguishable from Zygostates, whereas Dunstervillea has as its main characteristic the calcarate labellum, also found in Centroglossa. We clarify the systematic and phylogenetic positioning of Centroglossa and Dunstervillea in the Ornithocephalus clade (OC) through analysis of maximum likelihood, Bayesian inference, and maximum parsimony from molecular data (nrITS and matK cpDNA) and morphology. Our results indicate that Dunstervillea is phylogenetically close to Eloyella; both genera have a psigmoid habit, single-sided and flattened leaves, floral perianth with the same coloring, petals with entire margins, and a short rostellum. Centroglossa appears as a subclade within Zygostates. In addition to several homoplastic features, these two genera have the dorsal position of viscidium as a synapomorphy. The calcarate labellum, common to Centroglossa and Dunstervillea, originated more than once in the OC. Based on the phylogenetic results, we propose the nomenclatural changes to include Dunstervillea in Eloyella and Centroglossa in Zygostates. New synonyms are indicated to Zygostates greeniana and Z. nunes-limae and lectotypes are indicated to Centroglossa macroceras and C. glaziovii.

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Centroglossa tripollinica (Barb. Rodr.) Barb. Rodr. (Orchidaceae: Oncidiinae): lectotypification and rediscovery in the State of Paraná, Brazil

Cited by 2 publications

References 4 publications

Floral development of theOrnithocephalusclade (Oncidiinae, Orchidaceae): the origin of the tabula infrastigmatica, gynostemium appendices and labellar callus

Floral development of theOrnithocephalusclade (Oncidiinae, Orchidaceae): the origin of the tabula infrastigmatica, gynostemium appendices and labellar callus

Phylogenetic Position ofCentroglossaandDunstervillea(OrnithocephalusClade: Oncidiinae: Orchidaceae) Based on Molecular and Morphological Data

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