Synonymies and typifications in Portulaca (Portulacaceae) of Brazil

After a systematic revision of Portulaca L. (Portulacaceae) from Brazil, which included field work, studying herbarium specimens and relevant literature and original elements, the taxonomic observations and nomenclatural notes are here reported. Types were sought and most of them located. Synonymies (20), lectotypes (5), epitype (1) and neotype (1) are designated and defined.