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A New Species of Brachystele (Spiranthinae, Orchidaceae) with Nonresupinate Flowers from Central East Argentina

2023; American Society of Plant Taxonomists; Volume: 48; Issue: 4 Linguagem: Inglês

10.1600/036364423x17000842213533

1548-2324

Pablo Picca, Liliana M. Giussani, Osvaldo Morrone,

Plant Diversity and Evolution

Abstract— Brachystele morronei , a new orchid species recently discovered in the central-eastern region of Argentina, is described and illustrated. It is the first known species with nonresupinate flowers of the Pelexia clade, constituting a very distinctive member of the group. The phylogenetic position of the new taxon was inferred from nuclear ribosomal DNA (ITS) and two plastid DNA regions ( matK and trnLF ). The combined nuclear and plastid data analyses using Bayesian and parsimony-based methods revealed that B. morronei is closely related to B. camporum . The geographic distribution and a conservation assessment of the new species are presented. Morphological differences among sympatric Brachystele species are described.