Plant Ecology and Evolution 153(3): 399-426, doi: 10.5091/plecevo.2020.1609
Revision of Eulophia (Orchidaceae) in Nigeria, Cameroon, Equatorial Guinea, Gabon, and the Republic of the Congo
expand article infoEmma Ortúñez‡, Roberto Gamarra§, Sara Gestal‡, Álvaro Hernando‡, Pablo Galán Cela|
‡ Departamento de Biología, Universidad Autónoma de Madrid, C/ Darwin 2, ES–28049 Madrid, Spain§ Universidad Autónoma de Madrid, Madrid, Spain| Departamento de Sistemas y Recursos Naturales, Universidad Politécnica de Madrid, ES–28040 Madrid, Spain

Corresponding author: Emma Ortúñez ( emma.ortunez@uam.es )

© Emma Ortúñez, Roberto Gamarra, Sara Gestal, Álvaro Hernando, Pablo Galán Cela.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation: Ortúñez E, Gamarra R, Gestal S, Hernando Á, Galán Cela P (2020) Revision of Eulophia (Orchidaceae) in Nigeria, Cameroon, Equatorial Guinea, Gabon, and the Republic of the Congo. Plant Ecology and Evolution 153(3): 399-426. https://doi.org/10.5091/plecevo.2020.1609
Open Access
Abstract

Background and aims – The genus Eulophia (Orchidaceae) is revised for Nigeria, Cameroon, Equatorial Guinea, Gabon, and the Republic of the Congo. The aims are: to present a morphological characterization of the main vegetative and reproductive features of Eulophia to clarify the delimitation of the taxa within the genus in the studied countries; to provide an updated identification key and an updated checklist of the genus with nomenclatural data, distribution maps, ecological information, and preliminary conservation status. This revision may serve as a basis for future studies of the genus in other regions of Africa.

Material and methods – Relevant material kept in BM, BR, FHI, HBG, K, MA, P, and WAG was examined, using standard practices of herbarium taxonomy. Vegetative and reproductive structures were analysed. MapMaker was used to produce the distribution maps.

Key results – A total of 24 species are recognised in the study area. The variability of perennating organs, leaves, sepals and petals, lip (including ornamentation), spur, and anther cap are described and depicted, and were found to be informative for species recognition. A taxonomic treatment is given with an identification key, synonymy, distribution maps, preliminary conservation status, and specimen citations. Eulophia galeoloides is neotypified, E. brevipetala, E. leonensis, E. penduliflora, and Lissochilus elatus are lectotypified. According to our study, we consider E. parvula a synonym of E. pyrophila. E. sordida is considered as a doubtful species in the study area.

Keywords
Cymbidieae, ecology, Eulophiinae, identification key, taxonomy, typification, West Tropical Africa

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