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Type: Article
Published: 2022-11-25
Page range: 61-72
Abstract views: 50
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DNA links Andean tepui endemic Helonoma peruviana to Hapalorchis (Orchidaceae, Spiranthinae)

Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México, Apartado Postal 70-367, 04510 Mexico City, Mexico. Investigador Asociado, Instituto Nacional de Biodiversidad, Herbario Nacional del Ecuador (QCNE), Av. Río Coca E6-115 e Isla Fernandina, Sector Jipijapa, Quito 170501, Pichincha, Ecuador.
Grupo de Investigación en Medio Ambiente y Salud BIOMAS, Carrera de Ingeniería Agroindustrial y Alimentos, Facultad de Ingeniería y Ciencias Agropecuarias, Universidad de Las Américas, vía a Nayón, Quito 170137, Pichincha, Ecuador. Grupo Científico Calaway Dodson: Investigación y Conservación de Orquídeas del Ecuador, Quito 170510, Pichincha, Ecuador.
Grupo Científico Calaway Dodson: Investigación y Conservación de Orquídeas del Ecuador, Quito 170510, Pichincha, Ecuador. Vivero de Conservación La Paphinia, Avenida del Ejército y Juan Izquierdo, Zamora 190102, Zamora Chinchipe, Ecuador.
Centro Neotropical de Entrenamiento en Humedales-Perú, Carretera San Alberto km 5.5, Oxapampa, Pasco, Peru.
Andean tepui region Beloglottis Eurystyles molecular phylogenetics taxonomy Wallnoeferia Monocots

Abstract

Helonoma peruviana is here reported as a generic and specific addition to the Ecuadorian orchid flora based on a plant found recently in the Cordillera del Cóndor. The systematic position of H. peruviana was assessed by means of a Bayesian inference analysis of plastid (matK-trnK, trnL-trnF) and nuclear (ITS) DNA sequences from 43 genera and 50 species of Spiranthinae, plus suitable outgroups. The analysis recovered H. peruviana as the strongly supported sister of Hapalorchis, being more distantly related to Beloglottis, a genus in which Helonoma has been merged at the sectional level. Despite some differences in perianth morphology, Helonoma and Hapalorchis share both vegetative (densely pubescent roots, decumbent rhizome) and reproductive traits (similar column and pollinarium morphology). Helonoma has a disjunct distribution between the Guiana Shield and the Andean tepui region, and H. peruviana is restricted to the later in Colombia, Ecuador, and Peru.

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