The leaves got right again: DNA phylogenetics supports a sister-group relationship between Eurystyles and Lankesterella (Orchidaceae: Spiranthinae)

Authors

  • Gerardo Salazar Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México, Apartado Postal 70-367, 04510 Mexico, D.F., Mexico
  • Robert Dressler Jardín Botánico Lankester, Universidad de Costa Rica. P. O. Box 1031-7050, Cartago, Costa Rica

DOI:

https://doi.org/10.15517/lank.v11i3.18289

Keywords:

Orchidaceae, Spiranthinae, Eurystyles, Lankesterella, molecular phylogeny

Abstract

In spite of noticeable non-floral similarities such as their unusual epiphytic habit and vegetative morphology, Eurystyles and Lankesterella have been regarded by taxonomists who rank floral characters above all other sources of information as only distantly related. Here we assess the phylogenetic relationships of these genera, analyzing over 4500 characters of nuclear (nrITS) and plastid (matK-trnK, trnL-trnF) DNA sequences from 29 species/22 genera of Spiranthinae (plus appropriate outgroups); three structurally distinctive species of Eurystyles and two of Lankesterella were included. Both our parsimony and Bayesian phylogenetic analyses recovered Eurystyles and Lankesterella as sister taxa with strong internal support. The Eurystyles/Lankesterella clade is in turn supported as sister to the “Spiranthes clade.” Our results agree with previous interpretations of a close relationship between these two genera based on their shared epiphytic habit and similar vegetative morphology, indicating that floral morphology is evolutionarily labile in these groups and thus less reliable as an indicator of phylogenetic relationship than more conservative vegetative morphology. 

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Published

2011-11-20

How to Cite

Salazar, G., & Dressler, R. (2011). The leaves got right again: DNA phylogenetics supports a sister-group relationship between Eurystyles and Lankesterella (Orchidaceae: Spiranthinae). Lankesteriana: International Journal on Orchidology, 11(3). https://doi.org/10.15517/lank.v11i3.18289

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