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.

/pdf/phylogeny-of-hedyotis-l-rubiaceae-spermacoceae-redefining-a-1ao9ala4uw.pdf

Phylogeny of Hedyotis L. (Rubiaceae Spermacoceae) : Redefining a complex Asian-Pacific assemblage

Three new species of Ventilago from Malesia are described and illustrated here: V crenata from New Guinea, V ferruginea from Borneo, Singapore and Sumatra and V flavovirens from Borneo The morphology of V dichotoma , V ferruginea and V flavovirens is compared, and a key to the Ventilago species of Borneo is presented An IUCN conservation status assessment is given for each new species

/pdf/three-new-species-of-ventilago-rhamnaceae-from-south-east-41kwhy935c.pdf

Three new species of Ventilago (Rhamnaceae) from South-East Asia

/pdf/new-species-lectotypes-and-synonyms-of-australasian-nymphaea-55ye7ynm17.pdf

New species, lectotypes and synonyms of Australasian Nymphaea (Nymphaeaceae)

DARWIN, S. P. (2010). A taxonomic revision of Timonius subgen. Pseudobobea (Valeton) S. P. Darwin (Rubiaceae). Candollea 65: 217–240. In English, English and French abstracts. Twenty-one species, distributed from Sulawesi (Indonesia) to Rossel Island (Louisiade Archipelago) through the Moluccas (Indonesia) and Papua New Guinea, are assigned to Timonius subgen. Pseudobobea (Valeton) S. P. Darwin, a new taxon based on Timonius sect. Pseudobobea Valeton (Rubiaceae, Guettardeae). Nine new species are described: Timonius akunensis S. P. Darwin, Timonius bracteoides S. P. Darwin, Timonius carrii S. P. Darwin, Timonius clathratus S. P. Darwin, Timonius leptocalyx S. P. Darwin, Timonius moluccanus S. P. Darwin, Timonius reflexus S. P. Darwin, Timonius repertus S. P. Darwin, and Timonius rosselensis S. P. Darwin. Species of the new subgenus are distinctive in having usually vertically oriented fruit pyrenes, reflexed calyx lobes, and leaf blades with corivate venation. Lectotypes are designed for the name...

https://bioone.org/journals/candollea/volume-65/issue-2/c2010v652a5/A-Taxonomic-Revision-of-Timonius-Subgen-Pseudobobea-Valeton-S-P/10.15553/c2010v652a5.pdf

A taxonomic revision of Timonius subgen. Pseudobobea (Valeton) S. P. Darwin (Rubiaceae)

Five new combinations and one new name are proposed for six Rubiaceae species from South-East Asia. Four new combinations are proposed in Cyclophyllum and one in Psychotria; a new name is proposed for one Psychotria species.

/pdf/five-new-combinations-and-one-new-name-in-rubiaceae-from-2rp7t4w6at.pdf

E D Merrill

Papers

Plantae papuanae archboldianae, x