uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Phylogeny of Hedyotis L. (Rubiaceae Spermacoceae): Redefining a complex Asian-Pacific assemblage
Uppsala University, Music and Museums, The Linnean Gardens of Uppsala.
Show others and affiliations
2013 (English)In: Taxon, ISSN 0040-0262, Vol. 62, no 2, 357-374 p.Article in journal (Refereed) Published
Abstract [en]

The genus Hedyotis (Rubiaceae: Spermacoceae) has long served as a repository for tropical herbaceous species that do not fit readily into other genera. Circumscribed broadly the genus becomes a highly heterogeneous assembly, but relationships of Hedyotis have been difficult to resolve and it has proven very difficult to circumscribe the genus in a more narrow sense. Here we present Bayesian phylogenetic analyses of Hedyotis using plastid (rps16, petD) and nuclear (ITS, ETS) sequence data to resolve monophyletic lineages, to test former taxonomic hypotheses, and to revise the taxa within a well-supported evolutionary framework. Four hundred and sixty-seven sequences representing 129 accessions, never previously included in any phylogenetic analyses, are newly reported. Hedyotis, as previously circumscribed, is polyphyletic, but all investigated species, except for Hedyotis coronaria, are resolved in one of three well-supported monophyletic groups. The largest clade includes all investigated species of Hedyotis from the Indian subcontinent as well as three groups of species with primarily Chinese distributions. The type species of Hedyotis (H. fruticosa) is resolved with the Indian subcontinent species and following previous suggestions this group is referred to as Hedyotis s.str. Species currently recognized under the generic names Metabolos and Pleiocraterium are resolved in Hedyotis s.str. The second-largest group comprises a series of smaller, but well-supported, clades including the Leptopetalum clade, the genus Kadua, an unnamed group distributed in Asia and the Pacific, and a large Asian group referred to here as the ExallagelDimetia clade. The third group includes a few SE Asian Hedyotis, as well as all investigated species of the genus Neanotis. Hedyotis coronaria is not closely related to other species from Asia and is resolved with Spern2acoce hispida. The analyses indicate that diplophragmous capsules and "fruticosa-type" seeds occur outside of Hedyotis s.str., and several species suggested to have these features are resolved in the ExallagelDimetia clade. Species suggested to have indehiscent capsules, a feature used by Bremekamp to characterize the genus Exallage, are also resolved in both the ExallagelDimetia clade and in Hedyotis s.str., but a close examination indicates that the capsules are not truly indehiscent in the Hedyotis s.str. species. One species of Metabolos and one species of Pleiocraterium are given new species names, and one species of Pleiocrateriam is transferred to Hedyotis and three species of Hedyotis are transferred to Neanotis.

Place, publisher, year, edition, pages
2013. Vol. 62, no 2, 357-374 p.
Keyword [en]
Asia, Hedyotis, phylogenetic analysis, Rubiaceae, Spermacoceae
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-207116DOI: 10.12705/622.2ISI: 000322751000008OAI: oai:DiVA.org:uu-207116DiVA: diva2:647016
Available from: 2013-09-10 Created: 2013-09-09 Last updated: 2013-09-10Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Kårehed, Jesper
By organisation
The Linnean Gardens of Uppsala
In the same journal
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 198 hits
ReferencesLink to record
Permanent link

Direct link