Background and aims – Molecular phylogenetic studies have provided a clearer understanding of the complex relationships within the family Cyperaceae. These studies have consistently shown that 12 allied genera are nested in the genus Cyperus. However, early Sanger sequencing-based phylogenies that included the two species of the small South American genus Androtrichum were inconclusive in placing this genus either as sister to Cyperus or as part of its early divergent lineages. A recent phylogenetic analysis however conclusively placed the two species of Androtrichum within the C3 Cyperus Grade. In this study, we investigate if the morphology and anatomy of Androtrichum species provide additional evidence for their placement in the genus Cyperus. In addition, we provide descriptions and distribution data for the species.Material and methods – Herbarium material from FLOR, FURB, GENT, ICN, and K has been studied. Samples of the culm and leaf were studied using histological methods. Taxonomic changes and typifications of names were performed according to the International Code of Nomenclature for algae, fungi, and plants. Key results – The morphology and the non-Kranz anatomy observed in the Androtrichum species confirm their placement among the other C3  Cyperus species. Androtrichum is combined into Cyperus. For one species, a combination in Cyperus is already available: Cyperus trigynus. For the other species, a new name in Cyperus is published: Cyperus byssaceus. Two typifications are established and morphological descriptions and distribution data are provided. Conclusion – By integrating recent molecular phylogenetic data with additional evidence from morphology and anatomy, Androtrichum is combined into Cyperus. As a result of this taxonomic change, a single monophyletic genus Cyperus is now recognised in the Cyperus Clade of tribe Cypereae.

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Cyperus tuckerianus is a new species described to the Central-West Region of Brazil. This species is similar to Cyperus unioloides, Cyperus lanceolatus var. compositus and Cyperus lanceolatus var. subunioloides, however the new species is distinguished by its lax anthela, simple or compound with spikelets digitiform or grouped in glomerules, by the size of the spikelets and anthers and narrower rachilla. Morphological description, illustration, identification key, data about the habitat and comparisons with similar species are presented.

Cyperus prophyllatus, an endangered new species of Cyperus (Cyperaceae) from an aquatic ecosystem of the Atlantic Forest, Espírito Santo State, southeastern Brazil, is described and illustrated. The spikelet morphology of Cyperus prophyllatus is unique among the c. 950 species of Cyperus in having both a conspicuous spikelet prophyll and a corky rachilla articulation, which remain persistent at the base of the spikelet after disarticulation. Our molecular phylogenetic data support the placement of C. prophyllatus in the C3 Cyperus Grade and more precisely in the clade representing Cyperus sect. Oxycaryum, which also includes C. blepharoleptos and C. gardneri. Anatomical and (micro)morphological analyses corroborate the phylogenetic results, provide a better understanding of ecology and taxonomy, as well as reveal compatibility of structures with survival and dispersion in aquatic environments. A distribution map, table with distinctive characters of allied species, and conservation status are made available.

A taxonomic study of Cyperus L. (Cyperaceae) in the Central-West region of Brazil is presented. We examined more than 1300 herbarium specimens. Many of the species were also studied in the field. Our results recognize 59 species of Cyperus in the Central-West of Brazil, including three species endemic to the country that are potentially threatened with extinction, i.e., C. hooperae G. C. Tucker, C. longiculmis Pereira-Silva, Hefler & R. Trevis., and C. tuckerianus Pereira-Silva, Hefler & R. Trevis. Cyperus oxylepis Nees ex Steud. is reported from Brazil for the first time. Cyperus incomtus Kunth var. miguelii Kük. is proposed as a synonym of C. pearcei C. B. Clarke. We designate lectotypes for 20 names, a neotype for C. oxylepis, and an epitype for C. surinamensis Rottb. and select second-step lectotypes for 10 names. We also provide detailed morphological descriptions, illustrations, distribution data, an identification key for all species, and assessments of the conservation status for most species.

Resumo Neste estudo, nós apresentamos um levantamento das espécies de Cyperaceae ocorrentes na Baixada do Maciambú, a qual está localizada no Parque Estadual da Serra do Tabuleiro, Santa Catarina, Brasil. Obtivemos os dados a partir de expedições para coleta de material botânico e revisão de coleções de herbários, e a partir destes, realizamos análises tradicionais em taxonomia para a identificação das espécies. Nós reconhecemos 54 táxons, sendo que destes, 33 são novos registros para a Baixada do Maciambú. Além destes, também apresentamos outros 5 táxons como possíveis novas ocorrências para o local de estudo. Os gêneros mais representativos em número de espécies foram Cyperus (19 spp.), Eleocharis (11 spp.) e Rhynchospora (9 spp.). Nós fornecemos chaves para a identificação de gêneros e espécies, fotografias, informações sobre o hábitat e comentários complementares.

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