In the tropical Americas, the Orthosiinae (Apocynaceae) comprises plant species with small but intricate flowers and harbours a tremendous, still understudied diversity currently classified in four genera, Jobinia, Monsanima, Orthosia and Scyphostelma. In this study, we describe and illustrate four new species of Scyphostelma: S. bolivianum, S. gracile, S. rotorum and S. solomonii, based on specimens collected in Bolivia and Peru. Phylogenetic analysis places S. bolivianum and S. gracile in a clade with S. harlingii, a species from southern Ecuador and central Peru, together as sister clade to the rest of Scyphostelma. Due to the size of flowers and the long-filiform peduncles and pedicels, we consider the two new species S. rotorum and S. solomonii and the new combination S. erikseniae a part of the S. harlingii group, for which an identification key is presented. Furthermore, four species names are lectotypified and six new combinations in Scyphostelma are made: S. fasciculiflorum, S. jaramilloi, S. purpurascens, S. quitense, S. stenospira and S. unguiculatum. Citation: Pineda Y. M., Keller H. A., Balderrama-Torrico J. A., Meve U., Nürk N. M. & Liede-Schumann S. 2023: Phylogenetics in Scyphostelma (Apocynaceae: Orthosiinae) and description of new species.-Willdenowia 53: 83-112. Version of record first published online on 5 September 2023 ahead of inclusion in August 2023 issue.
CITATION STYLE
Pineda, Y. M., Keller, H. A., Balderrama-Torrico, J. A., Meve, U., Nürk, N. M., & Liede-Schumann, S. (2023). Phylogenetics in Scyphostelma (Apocynaceae: Orthosiinae) and description of new species. Willdenowia, 53(1–2), 83–112. https://doi.org/10.3372/wi.53.53201
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