Diversity and Taxonomy of Cyperus (Cyperaceae) in the Central-West Region of Brazil

Luciana Pereira-Silva; Isabel Larridon; André Rodolfo de Oliveira Ribeiro; Vinícius Martins Santos; Rafael Trevisan

doi:10.3417/2022760

Luciana Pereira-Silva Universidade Federal de Santa Catarina
Isabel Larridon Royal Botanic Gardens, Kew
André Rodolfo de Oliveira Ribeiro Universidade Federal do Ceará
Vinícius Martins Santos Laboratório S-Inova
Rafael Trevisan Universidade Federal de Santa Catarina

DOI: https://doi.org/10.3417/2022760

Keywords: Conservation, Cyperaceae, Cypereae, Cyperus, morphology, nomenclature, South America

Abstract

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.