The genus Cyperus (Cyperaceae) in Rio Grande do Norte State, Brazil

Abstract

Cyperus is a Pantropical genus and the second richest in species in Cyperaceae. It encompasses about 550 species worldwide, with about 100 of these occurring in Brazil. Studies on the taxonomy of this genus are scarce and punctual in Brazil. In this study, the occurrence of species was surveyed through 27 collecting expeditions across different regions in the state of Rio Grande do Norte and analyzis of specimens of several herbaria. Twenty four species of Cyperus were identified, including six new occurrences and one new species, here described, but that will be properly published in other work. This study includes a dichotomous key for the identification of the species, as well as illustrations, descriptions, taxonomic comments and geographical distribution.

Flora das cangas da Serra dos Carajás, Pará, Brasil: Cyperaceae

“…O g ê n e r o C y p e r u s c a r a c t e r i z a -s e principalmente por suas folhas dispostas em rosetas, escapos trígonos, inflorescência terminal, glumas dispostas disticamente, estiletes trífidos e aquênios trígonos (Goetghebeur 1998;Hefler 2007;Costa 2013;Ribeiro et al 2015). Filogenias recentes (Larridon et al 2011a;2011b;2011c;2013) indicam Cyperus monofilético com a inclusão Kyllinga Rottb., Lipocarpha R.…”

“…Cyperus haspan é reconhecida principalmente pela ausência das lâminas foliares, reduzidas a bainhas, caráter que pode ser bastante variável nos espécimes (Luceño et al1997;Araújo & LonghiWagner 1996;Ribeiro et al 2015), entretanto, essa variação não foi observada nas espécies analisadas, além dos escapos trígonos com lados côncavos e espiguetas digitadas, verdes a vináceas.…”

Floristic survey of the Mata do Junco Wildlife Refuge, Capela, Sergipe State, Brazil

“…Some of these (A. conyzoides, C. sylvestris and C. surinamensis) occur in all biomes in Brazil (Flora do Brasil 2020 em construção), being than A. conyzoides is recognized as an invasive species of crops (Klein & Fellipe 1991). In the Atlantic rainforest, C. surinamensis and M. scabra are typical of edges and capoeiras (Nascimento et al 2012, Ribeiro et al 2015, while C. sylvestre and C. hexandra are tree species classified in early secondary about the ecological group and are common in both the Atlantic rainforest and the Cerrado (Silva et al 2003, Paula et al 2004.…”

Integrative research identifies 71 new plant species records in the state of Rio Grande do Norte (Brazil) and enhances a small herbarium collection during a funding shortage

“…Recent taxonomic work has complemented this knowledge by focusing on specific taxonomic groups or on floristic studies. Groups that have been studied recently include Chamaecrista (Queiroz and Loiola 2009), Turneraceae (Rocha et al 2012), Paspalum (Oliveira et al 2013a), Leguminosae-Papilionoideae (São-Mateus et al 2013), Erythroxylaceae (Costa-Lima et al 2014), Capparaceae (Soares-Neto and Jardim 2015), Cyperus (Ribeiro et al 2015a), Fabaceae (Amorim et al 2016), and Bignoniaceae (Colombo et al 2016). Recent floristic studies focused on specific areas or vegetation types, such as the deciduous and semi-deciduous forests (Cestaro and Soares 2004; 2008), savanna (Oliveira et al 2012), riparian vegetation (Oliveira et al 2013b, Ribeiro et al 2014) and the herbaceous vegetation in Seridó (Santana and Souto 2006, Amorim et al 2006, Ferreira et al 2009, Queiroz et al 2015).…”