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The Hedyotis-Oldenlandia complex (Rubiaceae: Spermacoceae) in Asia and the Pacific: Phylogeny revisited with new generic delimitations

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Hedyotis and related genera (here called the Hedyotis-Oldenlandia complex) are highly debated groups in the Rubiaceae family with no consensus to date on their generic delimitations. The present study focuses on Asian-Pacific taxa from these groups and aims at resolving taxonomic inconsistencies by describing monophyletic genera within the complex. The generic circumscriptions presented in our study are based on the phylogenetic trees of nuclear (ITS, ETS) and plastid (petD, rps16) sequence data inferred using Bayesian and maximum likelihood methods. Morphological key features of the group such as habit, fruit type, seed form, and pollen type are studied and compared with the phylogeny to characterize the clades. Based on these results, the Asian-Pacific members are placed in 14 monophyletic groups across the Hedyotis-Oldenlandia complex. Of these, we accept and circumscribe 13 monophyletic genera: Debia, Dentella, Dimetia, Edrastima, Exallage, Hedyotis, Involucrella, Kadua, Kohautia, Leptopetalum, Neanotis, Oldenlandia, and Scleromitrion. Two of these, Debia and Involucrella, are here described as new genera.
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Keywords: ASIA-PACIFIC; FRUIT DEHISCENCE PATTERN; HEDYOTIS; OLDENLANDIA; PHYLOGENETIC ANALYSIS; POLLEN; SEED; SPERMACOCEAE

Document Type: Research Article

Affiliations: 1: Department of Biological Sciences, Old Dominion University, Norfolk, Virginia 23529-0266, U.S.A.,Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, Connecticut 06269-3043, U.S.A.;, Email: [email protected] 2: Botanic Garden Meise, Nieuwelaan 38, 1860 Meise, Belgium 3: Bergius Foundation, The Royal Swedish Academy of Sciences and Department of Ecology, Environment, and Plant Sciences, Stockholm University, 10691, Stockholm, Sweden 4: Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, Connecticut 06269-3043, U.S.A. 5: College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China 6: Department of Biological Sciences, Old Dominion University, Norfolk, Virginia 23529-0266, U.S.A.

Publication date: 2015-05-05

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