<i>Borreria</i> sect. <i>Pseudodiodia</i> (Rubiaceae) taxonomic and palynological contributions

Abstract

Taxonomy and palynology of the genus Borreria G. Mey. section Pseudodiodia Hassl. are updated. Four species are added to the section, three of them are described and illustrated, raising to ten the number of taxa included in it. Two of them live in Galapagos (B. suberecta Hook. f. and B. dispersa Hook. f.) and the other (B. decipiens K. Schum. and B. tocantinsiana E. L. Cabral & Bacigalupo) grow in Brazil. Pollen grains of these species were examined with light and scanning electron microscopy. The continental species present the typical pollen characteristics of Pseudodiodia (long colpi and tectatespinulate exine), whereas pollen produced by species living in Galapagos have variations in the exine.