Begonia mayasiana L.B.Sm. & B.G.Schub. is shown to be synonymous with Begonia albomaculata C.DC. An emended description and lectotypification of Begonia albomaculata is provided, and the species is recorded from the Peruvian regions of Amazonas, Loreto, San Martín, Huánuco and Ucayali; the Brazilian state of Acre; and the Ecuadorian province of Pastaza. The use of the name Begonia albomaculata in the Flora of Ecuador and related publications is a misapplication, and the specimens cited there represent an undescribed taxon closely related to Begonia tiliifolia C.DC., described in a companion paper in this volume. Taxonomic study of Begonia albomaculata prompted a re-evaluation of related Andean species. As a result, two further new species were identified, and Begonia longimaculata Irmsch. and Begonia maynensis A.DC. were found to be conspecific. The two new species are described as Begonia chemillenensis Moonlight sp. nov. and Begonia scorpiocaulis Moonlight & Tebbitt sp. nov., and are known only from the Pasco and Huánuco regions and the Madre de Dios region of Peru, respectively. Begonia longimaculata Irmsch. is newly treated here as a synonym of B. maynensis A.DC.

In the revision of Retrophyllum published in a previous issue of the Edinburgh Journal of Botany, the barcode for the specimen designated on page 208 line 10 as lectotype of Retrophyllum minus (Carrière) C.N. Page was incorrectly given as P00118110 instead of P00188110.

Begonia albomaculata as circumscribed in the Flora of Ecuador and related publications is shown to be a misapplied name and represents an undescribed species. This is described as Begonia botryoides Moonlight & Tebbitt sp. nov., and is recorded from the Pichincha, Santo Domingo de los Tsáchilas, Napo, Cotopaxi, Azuay and El Oro provinces in Ecuador, and the Antioquia and Chocó departments of Colombia. The taxonomic study of this species prompted a re-evaluation of related species. It was subsequently found that the Central American material previously included in Begonia tiliifolia C.DC. is distinct from the type and other South American material of this species and represents an undescribed species. This is described as Begonia boreoharlingii Tebbitt & Moonlight sp. nov., and is recorded from the Limón province in Costa Rica, and the Bocas del Toro and Coclé provinces in Panama. Four species, Begonia tiliifolia C.DC., Begonia harlingii L.B.Sm. & Wassh., B. botryoides and B. boreoharlingii, are placed in the informally named Begonia tiliifolia group. A key, descriptions, illustrations and distribution maps are provided for the members of the Begonia tiliifolia group, and its sectional classification is discussed.

Many papers submitted to the Edinburgh Journal of Botany are reviewed by members of the Editorial Board and Editorial Advisory Board. The members of both Boards wish to express their thanks to the following, who have also kindly reviewed papers during the preparation of this volume.

A taxonomic study was conducted of four Andean Begonia species, each originally described only from its type collection: Begonia hydrophylloides L.B.Sm. & B.G.Schub., B. triramosa Irmsch., B. velata L.B.Sm. & B.G.Schub. and B. xerophyta L.B.Sm. & Wassh. Amended descriptions of Begonia hydrophylloides and B. velata are provided. The distribution range of Begonia hydrophylloides is extended to include the Colombian department of Meta, as well as Cundinamarca. Begonia velata, originally described from Huncabamba Province, of Píura Region, Peru, has its distribution range extended to include Contumazá Province, of Cajamarca Region, Peru. Begonia triramosa, described from Chimborazo Province, Ecuador, and B. xerophyta, described from Loja Province, Ecuador, are both synonymised with B. acerifolia Kunth. Following an in-depth taxonomic study of Begonia acerifolia, an additional species, B. erythrocarpa A.DC., is synonymised with this species. An amended description of Begonia acerifolia is provided, and the species is recorded from Andean Ecuador, Peru and Bolivia. Begonia hydrophylloides, B. velata and B. acerifolia are all affiliated with species currently classified in the polyphyletic Begonia sect. Knesebeckia (Klotzsch) A.DC. Begonia hydrophylloides is assessed as Data Deficient (DD), B. velata is assessed as Vulnerable (VU) and B. acerifolia is assessed as Least Concern (LC), according to IUCN criteria.

The new species Ornithoboea grandiflora D.J. Middleton and new variety Ornithoboea maxwellii var. minutiflora D.J. Middleton are described.

Curcuma prasina (Zingiberaceae), a stenoendemic species from Thailand, is described and illustrated here. It differs from other similar species in Curcuma subgenus Hitcheniopsis in Thailand in its inflorescences composed of fertile green bracts only (lacking any white coma bracts), purple staminodes, and purple labellum with a bright yellow centre extending from the base to about two-thirds of the labellum towards the apex.