DisentanglingAntirhea(Rubiaceae): resurrection ofGuettardellaand description of the new genusAchilleanthus
- 23 March 2021
- journal article
- research article
- Published by Oxford University Press (OUP) in Botanical Journal of the Linnean Society
- Vol. 197 (1), 85-103
- https://doi.org/10.1093/botlinnean/boab013
Abstract
The Palaeotropical genus Antirhea (Guettardeae, Rubiaceae) currently comprises 37 dioecious species classified into three subgenera, Antirhea, Mesocarpa and Guettardella. It has a complex taxonomic history with varying generic delineation and variable application of species names. Recent phylogenetic studies have indicated the non-monophyly of Antirhea, but the limited sampling does not allow resolution of its circumscription or nomenclatural changes to be proposed. Here, we reconcile the generic boundaries of Antirhea based on phylogenetic analyses of two nuclear (ETS, ITS) and three plastid loci (atpB-rbcL, rps16, trnT-F) using Bayesian, maximum likelihood and parsimony methods. Our results show that Antirhea in its current circumscription is highly polyphyletic, whereas its three subgenera are retrieved as well-supported independent clades. A new generic framework is proposed based on phylogenetic results and supported by morphological evidence. We intend to restrict Antirhea to species native to the Mascarene Islands and Madagascar, to reinstate the genus Guettardella with emended diagnostic features and to describe the new genus Achilleanthus to accommodate the species of subgenus Mesocarpa plus Guettarda glabrescens, G. hypoplasia and G. ngoyensis. As a consequence, seven new combinations in Achilleanthus and 17 new combinations in Guettardella are made.Keywords
This publication has 49 references indexed in Scilit:
- MrBayes 3.2: Efficient Bayesian Phylogenetic Inference and Model Choice Across a Large Model SpaceSystematic Biology, 2012
- Rare and enigmatic genera (Dunnia, Schizocolea, Colletoecema), sisters to species-rich clades: Phylogeny and aspects of conservation biology in the coffee familyMolecular Phylogenetics and Evolution, 2008
- Polyphyly of Mussaenda inferred from ITS and trnT‐F data and its implication for generic limits in Mussaendeae (Rubiaceae)American Journal of Botany, 2005
- Molecular systematics of the Catesbaeeae‐Chiococceae complex (Rubiaceae): flower and fruit evolution and biogeographic implicationsAmerican Journal of Botany, 2005
- The tortoise and the hare II: relative utility of 21 noncoding chloroplast DNA sequences for phylogenetic analysisAmerican Journal of Botany, 2005
- Phylogeny and classification of Naucleeae s.l. (Rubiaceae) inferred from molecular (ITS, rBCL, and tRNT‐F) and morphological dataAmerican Journal of Botany, 2002
- Inferring the History of the Polyploid Silene aegaea (Caryophyllaceae) Using Plastid and Homoeologous Nuclear DNA SequencesMolecular Phylogenetics and Evolution, 2001
- Phylogeny of the Rubiaceae (Chiococceae) Based on Molecular and Morphological Data-Useful Approaches for Classification and Comparative EcologyAnnals of the Missouri Botanical Garden, 1992
- Universal primers for amplification of three non-coding regions of chloroplast DNAPlant Molecular Biology, 1991
- Estimating the Dimension of a ModelThe Annals of Statistics, 1978