Abstract Scherberich, D. & J.Duruisseau (2016). Begonia henrilaportei Scherber. & J. Duruisseau (Begoniaceae), a new endemic species from the Masoala peninsula, Madagascar. Candollea 71 : 13–18. In English, English and French abstracts. DOI : http://dx.doi.org/10.15553/c2016v711a3 Begonia henrilaportei Scherber. & J. Duruisseau, new species of Begoniaceae from the Masoala peninsula, in north-east Madagascar, is described and illustrated. It is provisionally placed in section Nerviplacentaria A. DC. and compared with Begonia lyallii A. DC. with which it presents morphological affinities. It is also compared with Begonia nana L'Her. and Begonia bogneri Ziesenh. with which it has been mistaken in herbarium. A comparative table of characters is provided. The new species differs from these three species by having a caulescent habit with a creeping stem and linear-lanceolate blades with pinnate venation. The diagnostic characters, geographic distribution and a preliminary conservation assessment of the new spec...