Summary Ventilagineae (Rhamnaceae) is a tribe of palaeotropical climbing plants, comprising two genera: Smythea and Ventilago . Previous studies have established the monophyly of the tribe, but the relationships within it remain unclear. This research includes six species of Smythea and seven species of Ventilago in a molecular phylogeny using the Angiosperms353 probe set. The results show that Ventilago is paraphyletic, with...

Summary We describe and illustrate Tragia grandistipularis (Euphorbiaceae), a new species from the Southern Region of Malawi, which is easily distinguished by its large stipules. We amend the key to the genus in Flora Zambesiaca to accommodate the new species. The new species is only known from a single population in a threatened habitat. Based on its limited known distribution and the threats to this habitat, we provisionally...

Summary The genus Ziziphus (Rhamnaceae) is revised for Borneo. 13 species are recognised using morphological evidence, including three new endemic species: Ziziphus cuspidata , Z. domatiata and Z. puberula . Borneo is therefore the island with the greatest known diversity of Ziziphus species. The area surrounding Mount Kinabalu is particularly diverse, with nine species occurring in Ranau. Two new varieties of Z. borneensis ar...

Summary The climbing genus Gouania (Rhamnaceae) is revised in western Malesia. Five species are recognised for the Philippines and Sundaland using morphological evidence, including a new species from the Philippines: Gouania longipedunculata . A taxonomic treatment, including a preliminary IUCN conservation status assessment, is presented for each species.