Phylogeny of the Asian Hedyotis–Oldenlandia complex (Spermacoceae, Rubiaceae): Evidence for high levels of polyphyly and the parallel evolution of diplophragmous capsules

Guo, Xing; Wang, Rui‐Jiang; Simmons, Mark P.; But, Paul Pui‐Hay; Yu, Jing

doi:10.1016/j.ympev.2013.01.006

Cited by 42 publications

(43 citation statements)

References 74 publications

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“…The present study expands on previous work (Wikström & al., 2013) by adding recent collections from China and Thailand. These new samples represent Dimetia, Thecagonum, and Scleromitrion (sensu Guo & al., 2013). Further, due to morphological similarities between some taxa we were also interested in the phylogenetic positions of Hedy otis coronaria and Oldenlandia ovatifolia in relation to our new additions of Hedyotis oligocephala (Pierre ex Pit.)…”

Section: Methodsmentioning

confidence: 99%

“…We will not discuss Kadua and Neanotis in detail in this paper as earlier studies (Guo & al., 2013;Wikström & al., 2013) have already shown them to be monophyletic with their own unique morphological traits. In order to avoid confusion with synonyms and until new generic combinations are provided, the names of the species discussed in the present study follow Govaerts & al.…”

Section: Methodsmentioning

confidence: 99%

“…Following studies at both the morphological (Terrell & Robinson, 2003;Neupane & al., 2009;Groeninckx & al., 2009bGroeninckx & al., , 2010a and molecular levels (Kårehed & al., 2008;Groeninckx & al., 2009a;Guo & al., 2013;Wikström & al.,…”

Section: Introductionmentioning

confidence: 99%

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

Neupane

Dessein

Wikström

et al. 2015

TAXON

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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:

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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

Neupane

Dessein

Wikström

et al. 2015

TAXON

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“…It is a conflicting taxon in its generic delimitation and together with the related genera, Hedyotis and Kohautia, they currently form an unresolved taxa complex called the "Hedyotis-Oldenlandia complex". According to Guo et al (2013), the species of that complex are grouped in seven clades of predominantly paleotropical distribution, where the paleotropical species are separated from the neotropical species.…”

Section: Introductionmentioning

confidence: 99%

Morpho-anatomical and morphometric studies of the floral structures of the distylous Oldenlandia salzmannii (Rubiaceae)

2016

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Th e genus Oldenlandia (Rubiaceae) has a confl icting generic delimitation, with representatives that show diff erent fl oral syndromes. Oldenlandia salzmannii is a marshy herb that is widespread in South America. It is heterostylous, specifi cally distylous, and self-compatible. Recent molecular phylogenetic studies found that this species forms a clade that is isolated from the remaining described taxa of Oldenlandia. Information about the fl oral anatomy and reproductive biology of genera in the Spermacoceae tribe, particularly Oldenlandia, is insuffi cient, especially among the neotropical species. Accordingly, the present study aimed at contributing information on the reproductive biology of Oldenlandia salzmannii by analyzing its fl oral morpho-anatomy, morphometrics and phenology of both fl oral morphs. Th ese analyses were conducted with natural, cultivated and fi xed material using optical and scanning electron microscopes. Morphologically, the species is typically heterostylous with two fl oral morphs, long-styled and short-styled, the main diff erence being the indument of the corolla. Th e short-styled fl owers have larger anthers and pollen grains. Morphometrics show a high degree of herkogamic reciprocity. Th e mature ovules have a hemitropous position, which is the fi rst record of this position for the Spermacoceae tribe. Th is study represents the fi rst comprehensive morphological study of Oldenlandia salzmannii.

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“…The genus Hedyotis L. is a member of the tribe Spermacoceae in the coffee family Rubiaceae (Bremer and Manen 2000, Kårehed et al 2008, Groeninckx et al 2009, Guo et al 2013, Wikström et al 2013) comprising 500-600 species when broadly circumscribed (Wikström et al 2013, Neupane et al 2015, and mainly distributed in tropical and subtropical regions of the world (Ko 1999, Dutta and Deb 2004, Chen and Taylor 2011. The genus comprises perennial herbs and shrubs characterized by opposite leaves, raphides present in tissues, multi-ovulate locules, four-merous flowers, two-celled capsules and triangular or dorsiventrally compressed seeds (Gao et al 2005, Kårehed et al 2008, Groeninckx et al 2009.…”

Section: Introductionmentioning

confidence: 99%

Hedyotis austrosinica sp. nov. (Rubiaceae) from southern China: A new heterostylous species similar to H. pulcherrima

Yang

Zhou

et al. 2018

Nordic Journal of Botany

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Hedyotis austrosinica L. Wu & L.H. Yang is described as a new species from southern China. It is similar to H. pulcherrima, but can be separated by its herbaceous weak to ascending habit with dense pubescence on the surface of most organs, 4‐angled to subterete stems, longer petioles, and longer stipules with 5–9 apical linear lobes. The new species is distributed in Guangdong and Guangxi in southern China.

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Phylogeny of the Asian Hedyotis–Oldenlandia complex (Spermacoceae, Rubiaceae): Evidence for high levels of polyphyly and the parallel evolution of diplophragmous capsules

Cited by 42 publications

References 74 publications

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

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

Morpho-anatomical and morphometric studies of the floral structures of the distylous Oldenlandia salzmannii (Rubiaceae)

Hedyotis austrosinica sp. nov. (Rubiaceae) from southern China: A new heterostylous species similar to H. pulcherrima

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