Synopsis of Tridactyle (Orchidaceae: Epidendroideae: Vandeae: Angraecinae) in São Tomé and Príncipe, with the Description of Four New Species

Tania D'haijère; Murielle Simo-Droissart; Vincent Droissart; Faustino Oliveira; Tariq Stévart

doi:10.3417/2022769

Tania D'haijère Université Libre de Bruxelles https://orcid.org/0000-0001-5781-3027
Murielle Simo-Droissart University of Yaoundé I
Vincent Droissart Université Libre de Bruxelles
Faustino Oliveira Jardin Botânico de Bom Sucesso
Tariq Stévart Missouri Botanical Garden

DOI: https://doi.org/10.3417/2022769

Keywords: Angraecoid orchid, endemicity, Gulf of Guinea, IUCN Red List, oceanic islands, Orchidaceae, São Tomé and Príncipe, species delimitation, taxonomy, Tridactyle, typification

Abstract

A synopsis of Tridactyle Schltr. (Orchidaceae) in São Tomé and Príncipe is presented. We recognize nine species in São Tomé and Príncipe, including four new species. We describe here T. amadorii D’haijère, T. cocophila D’haijère, T. levelevis D’haijère & Stévart, and T. oboensis D’haijère & Stévart. Tridactyle armeniaca (Lindl.) Schltr., recorded by previous studies, is native to West Africa and is not found in São Tomé and Príncipe. Tridactyle exhibits an important diversification in São Tomé and Príncipe, with seven species being endemic (endemism rate > 75%). Here, new records are registered; the natural distribution ranges, habitat, ecology, and conservation status based on IUCN guidelines are detailed for all species; two names are lectotypified; and an identification key is provided.

Author Biography

Tariq Stévart, Missouri Botanical Garden