Abstract
The seventh paper of the series on orchid diversity in Vietnam includes descriptions of four species new to science (Goodyera umbonata, Myrmechis brachyscapa, Rhomboda obcordata, and Vietorchis proboscidea) and five new national records (Calanthe speciosa, Habenaria coultousii, Myrmechis urceolata, Paphiopedilum barbigerum var. barbigerum, and Peristylus affinis). Two new nomenclatural combinations, Rhomboda aurea (≡ Odontochilus aureus) and Odontochilus tonkinensis (≡ Anoectochilus tonkinensis), are proposed. Odontochilus putaoensis described from Myanmar and reported also from China and Laos is synonymized with Odontochilus umbrosus described 22 years earlier from Vietnam. Data on relevant synonyms and etymology are provided, along with morphological descriptions for the newly described species. For the species new to science and for the taxa reported for Vietnam for the first time, the information is given about studied specimens, ecology, phenology, distribution, and conservation status assessed according to the IUCN Red List Categories and Criteria, accompanied by brief taxonomic notes and illustrations.
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