Phylogenetics in Scyphostelma (Apocynaceae: Orthosiinae) and description of new species

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Pineda, Yam M. ; Keller, Hector ; Balderrama-Torrico, Jose ; Meve, Ulrich ; Nürk, Nicolai ; Liede-Schumann, Sigrid:
Phylogenetics in Scyphostelma (Apocynaceae: Orthosiinae) and description of new species.
In: Willdenowia. Bd. 53 (2023) Heft 1/2 . - S. 83-112.
ISSN 1868-6397
DOI der Verlagsversion: https://doi.org/10.3372/wi.53.53201

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Abstract

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 Scypho­ stelma. In this study, we describe and illustrate four new species of Scyphostelma: S. bolivianum, S. gracile, S. rotorum and S. solo­ monii, 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.