Abstract
A new species of Goodyera (Orchidaceae) from Tibet, China, G.medogensis, is described and illustrated here. Molecular phylogenetic results based on one nuclear (ITS) and two plastid markers (matK and trnL-F) support the recognition of G.medogensis as a new species in GoodyerasubsectionReticulum. Morphologically, the novelty is most similar to G.biflora, G.vittata and especially to G.hemsleyana, but differs by the thick grid lines of the reticulations with a diffused margin on the adaxial surface of the leaf blades, the inflorescence with more flowers, the obliquely obovate-rhombic petals, the yellow or yellowish labellum without a lamella on the blade, and the shorter trichomes on the floral bracts, sepals and ovary. Finally, a key to the species of Goodyerasubsect.Reticulum in China is also provided.
Highlights
Introduction(Orchidaceae) belongs to the subtribe Goodyerinae (Pridgeon et al 2003; Chase et al 2015), which includes three major subdivisions: the Pachyplectron clade, the Goodyera clade and the Cheirosylis clade (Chen et al 2019)
Based on our field observations of Goodyera in China in the past ten years, we identified three species that were closely related to the novelty, viz. G. hemleyana, G. biflora (Lindl.) Hook. f. and G. vittata Benth. ex Hook. f. (Fig. 1)
Our maximum likelihood (ML) and Bayesian inference (BI) phylogenetic trees constructed from the three datasets showed that our four samples of G. medogensis cluster into one separate subclade (Figs 2–4) which is nested in the clade of Goodyera subsection Reticulum S
Summary
(Orchidaceae) belongs to the subtribe Goodyerinae (Pridgeon et al 2003; Chase et al 2015), which includes three major subdivisions: the Pachyplectron clade, the Goodyera clade and the Cheirosylis clade (Chen et al 2019). Different phylogenetic studies have revealed that Goodyera is polyphyletic (Juswara 2010; Hu et al 2016; Chen et al 2019), which has led Pace (2020) to subsequently propose a new generic arrangement for the Goodyera clade including 11 genera: Goodyera s.s., Cionisaccus Breda, Aspidogyne Garay, Microchilus C. Since the available molecular phylogenetic results are based on few markers, and the quality and representativeness of samples are limited, in this study, we still accept a broad concept of Goodyera
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