The systematic position of Plethadenia within the Rutoideae sensu Engler is briefly discussed. A first record of Zanthoxylum rolandii for Hispaniola is given and discussed. Flowers, fruits and seeds of Z. haitiense are analysed for the first time and illustrated. A distribution map of Z. arnoldii, Z. haitense and Z. rolandii is provided. They are described, contrasted, and compared with their closest relatives, A. oblongata and A. chasmema.
Typification is discussed.
For A. linearifolia a lectotype is designated, after consideration of the notorious problems that are linked with the Cuban collections of Charles Wright, the discoverer of the species. The holotype of A. stenophylla was destroyed in 1943, and although duplicate material exists that was designated as lectotype, it is of a fragmentary nature, so that an epitype is designated in support. A species new to science, belonging to Wallenia subg. Homowallenia, has been discovered in the Sierra Maestra, Granma Province, in E Cuba. It is described and illustrated as W. maestrensis, then compared with its closest relative, W. bumelioides, known from several Cuban provinces and also illustrated.