Specimens of phanerogamic plants from the Catimbau National Park, located in northeastern Brazil, were collected during extensive fieldwork and analyzed together with information gathered from the specialized literature. A total of 613 species was recorded, belonging to 366 genera and 85 families. The largest families were Fabaceae, Poaceae, Euphorbiaceae, Asteraceae, Convolvulaceae, Malvaceae, Myrtaceae, Apocynaceae, Malpighiaceae, and Cyperaceae, comprising almost 60% of the species. The level of endemism found was below that projected in the literature, as only four known species are unique to the study area. The area is, however, home to a varied flora with high richness and numerous rare or threatened species, demonstrating the importance of the National Park for conserving the regional flora. Additionally, 34 new registrations are reported here for Pernambuco State.

Resumo Este trabalho consiste no levantamento florístico-taxonômico de Fabaceae em um afloramento rochoso situado no Semiárido paraibano, Nordeste brasileiro. Foram registradas 28 espécies em 22 gêneros e três subfamílias: Caesalpinioideae (12 spp.), Detarioideae (1 spp.) e Papilionoideae (15 spp.). As espécies Ancistrotropis peduncularis, Crotalaria pallida e Mimosa acutistipula consistem em novos registros para a flora da Paraíba. Foram produzidas chaves dicotômicas para as subfamílias e respectivas espécies, descrições para gêneros e espécies, comentários taxonômicos, dados de distribuição geográfica, ambientes, floração, frutificação e imagens das espécies encontradas durante esse estudo.

Cordia weddellii, a species of Cordia sect. Cordia (Cordiaceae, Boraginales) endemic to South America is recorded for the first time in Brazil, growing in Cerrado vegetation in Bahia and Tocantins states. A distribution map, photographs, comments on the habitat and phenology, and a preliminary conservation assessment are provided for the species. Additionally, we provide a lectotype for C. weddellii.

We present a list of aquatic and wetland plant species from the state of Paraíba, Brazil, based on the collections deposited in national and international herbaria. We identified 290 species belonging to 61 families. The checklist includes habit, localities of the collections in the state of Paraíba, and geographic distribution of each species. The amphibious habit was the most prevalent and the Sertão (semiarid inland region) was the region with the greatest collection effort. New occurrences have been registered for the state (14 species). Although our data reveal a high plant richness, we relate this richness to increased field expeditions.

The Caatinga is the largest Seasonally Dry Tropical Forest (SDTF) in South America with diverse geomorphological features. The “altitude marshes”, exceptional areas with altitudes above 700 m that were established in the humid mountains of the Caatinga, shelter vegetation characteristic of other phytogeographic domains. Despite the importance of these areas for the Brazilian semi-arid region, several of them still remain unknown, or little known, floristically. This study aims to update the floristic inventory of angiosperms in the recently created Serra do Teixeira National Park (PARNA), previously called Pico do Jabre State Park, in the State of Paraíba, Northeast Brazil. The checklist was prepared through field trips between 2018 and 2020 and compiled from a list of species published in 2004. The study compiled 335 species distributed in 70 families and 220 genera, while Fabaceae, Malvaceae and Asteraceae were the most representative families. Species richness depending on altitude was initially observed to be increasing, however, upon reaching intermediate levels of the altitudinal gradient, a decline in richness was observed, which continued to decrease until the top of the massif. Of the total number of documented species, there are representatives widely distributed in the Brazilian territory (141 spp.) as well as species also associated with the phytogeographical domains of Caatinga (281 spp.), Cerrado (254 spp.), Atlantic Forest (263 spp.), Amazon (157 spp.), Pampa (76 spp.) and Pantanal (82 spp.). The results demonstrate that the PARNA of Serra do Teixeira constitutes an important refuge for plant biodiversity, especially in the semi-arid region of Paraíba and Brazil.