Summary The Itremo Massif Protected Area was established and is managed by Kew Madagascar. Here, we publish a plant species checklist of the Itremo Massif Protected Area. It is one of the first expert-verified plant species checklists to be generated for a protected area in Madagascar and includes 749 plant species, 353 genera and 103 families. For each species, full synonymy, notes on vernacular names, global distribution, di...

Summary A new range-restricted species of Placodiscus Radlk. is described, mapped and illustrated. Placodiscus bijugus is a cauliflorous tree (4 –) 5 – 10 m tall, characterised by having leaves with two pairs of leaflets, 1 (– 2)-flowered cymules with minute bracts, a glabrous disk, pedicels 3 – 3.2 mm long and large (3 – 4 cm diam.), shortly stipitate, retuse fruits, orbicular in outline. It is similar to P. caudatus Pierre e...

Summary This paper is the fourth part of the taxonomic revision of the genus Phyllanthus in Madagascar and the Comoro Islands. Here we treat Pseudogomphidium Ralim. & Cable sect. nov. consisting of nine species that we misplaced in the subgenus Gomphidium (Baill.) G.L.Webster in our previous paper. Two species are new to science: Phyllanthus razakamalalae Ralim. & Cable, sp. nov. and P. ankirindrensis Ralim. & Cable, sp. nov....