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Background: The Atlantic Forest is one of the most threatened biomes in the world. Despite that, this biome still includes many areas that are poorly known floristically, including several protected areas, such as the "Floresta Nacional do Rio Preto" ("Flona do Rio Preto"), located in the Brazilian State of Espírito Santo. This study used a published vascular plant species list for this protected area from the "Catálogo de Plantas das Unidades de Conservação do Brasil" as the basis to synthesise the species richness, endemism, conservation and new species occurrences found in the "Flona do Rio Preto"., New Information: The published list of vascular plants was based on field expeditions conducted between 2018 and 2020 and data obtained from herbarium collections available in online databases. Overall, 722 species were documented for the "Flona do Rio Preto", 711 of which are native to Brazil and 349 are endemic to the Atlantic Forest. In addition, 60 species are geographically disjunct between the Atlantic and the Amazon Forests. Most of the documented species are woody and more than 50% of these are trees. Twenty-three species are threatened (CR, EN and VU), while five are Data Deficient (DD). Thirty-two species are new records for the State of Espírito Santo. Our results expand the knowledge of the flora of the Atlantic Forest and provide support for the development of new conservation policies for this protected area., (Anderson Alves-Araújo, Marina M Moreira, Tatiana T Carrijo, Lúcia G Lohmann, Adriana Q Lobão, Alana F Scheidegger, Aline D Firmino, Aline Vieira de Melo Silva, Álvaro Nepomuceno, Amélia C Tuler, André MA Amorim, André LC Moreira, Braz AP Cosenza, Brenno G Sossai, Christian Silva, Claudia R Lopes, Daniele Monteiro, Dayvid R Couto, Duane F Lima, Eduardo C Dalcin, Eliana Ramos, Elton J Lírio, Fatima Salimena, Felipe Alves de Oliveira, Fernanda RM Fraga, Filipe Torres-Leite, Guilherme M Antar, Gustavo H Shimizu, Haroldo C Lima, Herison Medeiros, Jaquelini Luber, Jheniffer A Christ, João Lanna, João Paulo F Zorzanelli, Joelcio Freitas, José FB Pastore, José IM Melo, Juliana Paula-Souza, Juliana RPM Oliveira, Leandro C Pederneiras, Leandro Freitas, Leandro L Giacomin, Leonardo D Meireles, Luis AE Silva, Luiz JS Pinto, Luiz Menini Neto, Marcelo Trovó, Mário L Garbin, Marli P Morim, Michel Ribeiro, Nelson TL Pena, Paulo H Labiak, Pedro H Cardoso, Pedro L Viana, Pedro LR Moraes, Quélita S Moraes, Raquel F Zorzanelli, Renara N Amaral, Renata C Asprino, Renato Goldenberg, Ricardo Magnago, Ricardo S Couto, Sandrine C Dutra, Saúl E Hoyos-Gómez, Tamara AF Vieira, Thiago B Flores, Valquíria F Dutra, Víctor S Miranda, Vitor C Manhães, Rafaela C Forzza.)

Background: Brazilian protected areas are essential for plant conservation in the Atlantic Forest domain, one of the 36 global biodiversity hotspots. A major challenge for improving conservation actions is to know the plant richness, protected by these areas. Online databases offer an accessible way to build plant species lists and to provide relevant information about biodiversity. A list of land plants of "Parque Nacional do Caparaó" (PNC) was previously built using online databases and published on the website "Catálogo de Plantas das Unidades de Conservação do Brasil." Here, we provide and discuss additional information about plant species richness, endemism and conservation in the PNC that could not be included in the List. We documented 1,791 species of land plants as occurring in PNC, of which 63 are cited as threatened (CR, EN or VU) by the Brazilian National Red List, seven as data deficient (DD) and five as priorities for conservation. Fifity-one species were possible new ocurrences for ES and MG states., New Information: "Parque Nacional do Caparaó" houses 8% of the land plant species endemic to the Brazilian Atlantic Forest, including 6% of its angiosperms, 31% of its lycophytes and ferns and 14% of its avascular plants. Twelve percent of the threatened species listed for the State of Espírito Santo and 7% listed for the State of Minas Gerais are also protected by PNC. Surprisingly, 79% of the collections analysed here were carried out in Minas Gerais, which represents just 21% of the total extension of the Park. The compiled data uncover a huge botanical collection gap in this federally-protected area., (Marina M Moreira, Tatiana T Carrijo, Anderson G Alves-Araújo, Alessandro Rapini, Alexandre Salino, Aline D Firmino, Aline P Chagas, Ana F A Versiane, André M A Amorim, Andrews V S da Silva, Amélia C Tuler, Ariane L Peixoto, Bethina S Soares, Braz A P Cosenza, Camila N Delgado, Claudia R Lopes, Christian Silva, Daniel E F Barbosa, Daniele Monteiro, Danilo Marques, Dayvid R Couto, Diego R Gonzaga, Eduardo Dalcin, Elton John de Lirio, Fabrício S Meyer, Fátima R G Salimena, Felipe A. Oliveira, Filipe S Souza, Fernando B Matos, Gabriel Depiantti, Guilherme M Antar, Gustavo Heiden, Henrique M Dias, Hian C F Sousa, Isabel T F V Lopes, Isis M Rollim, Jaquelini Luber, Jefferson Prado, Jimi N Nakajima, João Lanna, João Paulo F Zorzanelli, Joelcio Freitas, José F A Baumgratz, Jovani B S Pereira, Juliana R P M Oliveira, Kelly Antunes, Lana S Sylvestre, Leandro C Pederneiras, Leandro Freitas, Leandro L Giacomin, Leonardo D Meireles, Leonardo N Silva, Luciana C Pereira, Luís Alexandre E Silva, Luiz Menini Neto, Marcelo Monge, Marcelo L O Trovó, Marcelo Reginato, Marcos E G Sobral, Mario Gomes, Mário L Garbin, Marli P Morim, Nayara D Soares, Paulo H E Labiak, Pedro L Viana, Pedro H Cardoso, Pedro L R Moraes, Pedro B Schwartsburd, Quélita S Moraes, Raquel F Zorzanelli, Renara Nichio-Amaral, Renato Goldenberg, Samyra G Furtado, Thamara Feletti, Valquíria F Dutra, Vinícius R Bueno, Vinícius A O Dittrich, Rafaela C Forzza.)