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The Reserva Biológica do Tinguá is a protected area located in Rio de Janeiro state, Brazil. It is part of the Atlantic Forest domain and primarily features Dense Ombrophilous Forest, ranging from lowland to submontane, montane, and highland vegetation types. The Reserva Biológica do Tinguá is critically important for conservation, ranking among the priority areas for protecting the biodiversity of the Atlantic Forest, as well as local water supply. Understanding and accessing the floristic list within the regions is essential to developing effective conservation strategies. We utilize herbaria databases to create a comprehensive list of plant species based on revised taxonomic data. The updated list of vascular plants recorded in Rebio Tinguá is available in the “Catálogo de Plantas das Unidades de Conservação do Brasil” and is presented here with additional details on species richness, endemism, and conservation status. The Reserva Biológica do Tinguá contains 1,301 species of vascular plants, including 1,133 angiosperms, one gymnosperm, and 167 are ferns and lycophytes. Of these species, 52,2% are endemic to the Atlantic Forest. There are 97 threatened species, of which five are considered Critically Endangered (CR), 57 Endangered (EN), and 36 Vulnerable (VU) at national level. Among the threatened species, 86 are endemic to the Atlantic Forest. The number of records and species richness in this area are notably high, comparing to Atlantic Forest standards. Protecting areas like the Reserva Biológica do Tinguá in densely populated urban centers presents considerable challenges due to environmental degradation, including air and water pollution and extraction of natural resources. Recognizing the ecological significance and promoting floristic studies of the remaining fragments of the Atlantic Forest is essential for biodiversity conservation ensuring overall environmental integrity.

A new species of Bignoniaceae from Brazilian cerrado and caatinga is described and illustrated: Xylophragma tenue. The species is characterized by its slightly bullate leaves, lateral leaflets with asymmetrical base, loosely branched inflorescence, flowers with tubular calyx with a shortly 5-cuspidate and frequently bilabiate rim, infundibuliform corolla, and capsules flat, woody, smooth, and with raised margins. Comments on distribution, phylogenetic affinities, and comparisons with morphologically similar species are also presented.

Fridericia is a genus of lianas with around 60 species distributed from Mexico through northern Argentina and southern Brazil. The genus is recognized by a combination of vegetative and floral characters. Here, we describe a new species from Brazilian Amazonia, Fridericia caudata which is found only in Central Brazil, in the southern portion of the Amazonian rainforest. This new species is easily recognized by its peculiar flowers with flattened tubes and caudate corolla lobes. Here, we provide a detailed description, diagnosis, illustrations, and comments on the habitat, conservation status, and related species.

The plant family Bignoniaceae has a complicated history of supra-specific level systematics. In the past decade, molecular phylogenetic studies have contributed substantially to an improved circumscription of clades at all taxonomic levels, especially at the generic and tribal levels. For instance, a molecular phylogeny of the tribe Bignonieae reconstructed a polyphyletic Arrabidaea, and proposed a newcircumscription for members of the Arrabidaea & Allies clade. Within this newclassification, most species previously included in Arrabidaea were distributed among four genera: Cuspidaria (19 spp.), Fridericia (67 spp.), Tanaecium (17 spp.), and Xylophragma (7 spp.). The taxonomy of Fridericia, the genus that received most species of Arrabidaea, remains complicated due to the high morphological variability and broad distribution of its species. Here, we used molecular data and a broad sampling of taxa within the Arrabidaea & Allies clade to reconstruct the phylogeny of Fridericia. We then studied the morphology of all species of Fridericia and identified morphological synapomorphies that characterize major clades that represent meaningful units for future taxonomic studies. Most genera included in the Arrabidaea & Allies clade were retrieved as monophyletic; however, two species of Fridericia were reconstructed within Cuspidaria, while three species of Fridericia were placed within Tanaecium. The molecular phylogenetic placements received additional support from morphology, and the necessary taxonomic changes are proposed. We combine three species of Fridericia into Tanaecium (T. dichotomum comb. nov., T. paradoxum comb. nov., T. parviflorum comb. nov.), two species into Xylophragma (X. claussenii comb. nov., X. corchoroides comb. nov.), two species into Cuspidaria (C. bracteolata comb. nov., C. monophylla comb. nov.), and one species of Adenocalymma into Fridericia (F. trichoclada comb. nov.). We also synonymize Fridericia whitei into Cuspidaria pulchra. We present a key for the seven main clades identified within the genus, as well as a detailed morphological description for Fridericia and its major lineages.

Fridericia is a conspicuous genus of neotropical lianas, with 60 species distributed among seven lineages that are broadly distributed through the neotropics in both dry and wet environments. As part of ongoing taxonomic studies of the genus, we provide taxonomic revisions of two clades: (1) the “Acrodromous venation” clade and (2) the “Piriadacus” clade. The former is characterized by 1- or 2-foliolate leaves with acrodromous venation, tubular calyces and coriaceous fruits with slightly raised edges. The latter is recognized by the red, pink-reddish or orange, tubular corolla and exserted or sub-exserted anthers. We recognize two species in each lineage and provide identification keys, morphological descriptions, illustrations, distribution maps and comments on the distribution, phenology, conservation status and taxonomy. We propose the lectotypification of 13 names: Arrabidaea brachypoda var. acuminata, A. brachypoda var. attenuata, A. brachypoda var. firma, A. brachypoda var. induta, A. brachypoda var. rigida, A. platyphylla var. lasiorrhachis, A. platyphylla var. puberula, Bignonia brachypoda var. firmula, B. erubescens var. breviflora, B. erubescens var. subtruncata, B. regnelliana, Cuspidaria erubescens var. glabrescens and Petastoma simplicifolium. We further correct the typification of B. erubescens var. breviflora and B. erubescens var. subtruncata and propose two new synonyms for F. platyphylla (i.e. A. celastroides and B. violacea). Citation: Kaehler M. & Lohmann L. G. 2021: Taxonomic revisions in Fridericia (Bignonieae, Bignoniaceae) I: the “Acrodromous venation” and “Piriadacus” clades. – Willdenowia 51: 181–194. Version of record first published online on 21 June 2021 ahead of inclusion in August 2021 issue.

A new species is described, Lundia laevis (Bignoniaceae). This species is distributed in the Brazilian Amazon and is characterized by its glabrescent stem, leaflets, and calyx, and the narrow infundibuliform corolla. A complete description, illustration, and comparisons with similar species are provided. Uma nova espécie é descrita, Lundia laevis (Bignoniaceae). Esta espécie se distribui na região Amazônica brasileira e é caracterizada pelo caule, folíolos e cálice glabrescentes e a corola estreito infundibuliforme. Aqui são apresentadas descrição, ilustração e comparações com as espécies mais próximas.

The \"Serra da Concórdia\" is part of the Atlantic Forest phytogeographical domain in the Brazilian state of Rio de Janeiro and it has a predominant phytophysiognomy of Semideciduous Seasonal Forest. This region underwent intense habitat loss and fragmentation during the 19 th century, due to coffee plantations and later pastures. With the decline of these activities, the areas were abandoned, triggering secondary succession. In 2002, the \"Parque Estadual da Serra da Concórdia\" was established in this region to preserve the remaining forest fragments. The updated list of vascular plants recorded in this protected area, published in the \"Catálogo de Plantas das Unidades de Conservação do Brasil\", is presented here, along with information on richness, endemism, and conservation status. The \"Parque Estadual da Serra da Concórdia\" houses 231 vascular plant species, of which 90% are angiosperms, 10% ferns and lycophytes, and 27% endemic to the Atlantic Forest. Ten species are threatened with extinction, three are categorized as Endangered, and seven as Vulnerable. Although there have been expeditions in the \"Parque Estadual da Serra da Concórdia\", they have been limited, resulting in a low number of records and the species richness for a protected area. This is notable considering the 2,130 Brazilian native vascular plant species recorded in the semideciduous seasonal forest of Rio de Janeiro. Our data indicates that floristic inventories of Brazilian protected areas could help highlight gaps in flora knowledge and support the proposal of effective conservation actions.

The \"Serra da Concórdia\" is part of the Atlantic Forest phytogeographical domain in the Brazilian state of Rio de Janeiro and it has a predominant phytophysiognomy of Semideciduous Seasonal Forest. This region underwent intense habitat loss and fragmentation during the 19th century, due to coffee plantations and later pastures. With the decline of these activities, the areas were abandoned, triggering secondary succession. In 2002, the \"Parque Estadual da Serra da Concórdia\" was established in this region to preserve the remaining forest fragments. The updated list of vascular plants recorded in this protected area, published in the \"Catálogo de Plantas das Unidades de Conservação do Brasil\", is presented here, along with information on richness, endemism, and conservation status.BackgroundThe \"Serra da Concórdia\" is part of the Atlantic Forest phytogeographical domain in the Brazilian state of Rio de Janeiro and it has a predominant phytophysiognomy of Semideciduous Seasonal Forest. This region underwent intense habitat loss and fragmentation during the 19th century, due to coffee plantations and later pastures. With the decline of these activities, the areas were abandoned, triggering secondary succession. In 2002, the \"Parque Estadual da Serra da Concórdia\" was established in this region to preserve the remaining forest fragments. The updated list of vascular plants recorded in this protected area, published in the \"Catálogo de Plantas das Unidades de Conservação do Brasil\", is presented here, along with information on richness, endemism, and conservation status.The \"Parque Estadual da Serra da Concórdia\" houses 231 vascular plant species, of which 90% are angiosperms, 10% ferns and lycophytes, and 27% endemic to the Atlantic Forest. Ten species are threatened with extinction, three are categorized as Endangered, and seven as Vulnerable. Although there have been expeditions in the \"Parque Estadual da Serra da Concórdia\", they have been limited, resulting in a low number of records and the species richness for a protected area. This is notable considering the 2,130 Brazilian native vascular plant species recorded in the semideciduous seasonal forest of Rio de Janeiro. Our data indicates that floristic inventories of Brazilian protected areas could help highlight gaps in flora knowledge and support the proposal of effective conservation actions.New informationThe \"Parque Estadual da Serra da Concórdia\" houses 231 vascular plant species, of which 90% are angiosperms, 10% ferns and lycophytes, and 27% endemic to the Atlantic Forest. Ten species are threatened with extinction, three are categorized as Endangered, and seven as Vulnerable. Although there have been expeditions in the \"Parque Estadual da Serra da Concórdia\", they have been limited, resulting in a low number of records and the species richness for a protected area. This is notable considering the 2,130 Brazilian native vascular plant species recorded in the semideciduous seasonal forest of Rio de Janeiro. Our data indicates that floristic inventories of Brazilian protected areas could help highlight gaps in flora knowledge and support the proposal of effective conservation actions.

The circumscription of genera belonging to tribe Bignonieae (Bignoniaceae) has traditionally been complex, with only a few genera having stable circumscriptions in the various classification systems proposed for the tribe. The genus Lundia, for instance, is well characterized by a series of morphological synapomorphies and its circumscription has remained quite stable throughout its history. Despite the stable circumscription of Lundia, the circumscription of species within the genus has remained problematic. This study aims to reconstruct the phylogeny of Lundia in order to refine species circumscriptions, gain a better understanding of relationships between taxa, and identify potential morphological synapomorphies for species and major clades. We sampled 26 accessions representing 13 species of Lundia, and 5 outgroups, and reconstructed the phylogeny of the genus using a chloroplast (ndhF) and a nuclear marker (PepC). Data derived from sequences of the individual loci were analyzed using parsimony and Bayesian inference, and the combined molecular dataset was analyzed with Bayesian methods. The monophyly of Lundia nitidula, a species with a particularly complex circumscription, was tested using Shimodaira-Hasegawa (SH) test and the approximately unbiased test for phylogenetic tree selection (AU test). In addition, 40 morphological characters were mapped onto the tree that resulted from the analysis of the combined molecular dataset in order to identify morphological synapomorphies of individual species and major clades. Lundia and most species currently recognized within the genus were strongly supported as monophyletic in all analyses. One species, Lundia nitidula, was not resolved as monophyletic, but the monophyly of this species was not rejected by the AU and SH tests. Lundia sect. Eriolundia is resolved as paraphyletic in all analyses, while Lundia sect. Eulundia is monophyletic and supported by the same morphological characters traditionally used to circumscribe this section. The phylogeny of Lundia contributed important information for a better circumscription of species and served as basis the taxonomic revision of the genus.

The presence in ecological communities of unfeasible species interactions, termed forbidden links, due to physiological or morphological exploitation barriers has been long debated, but little direct evidence has been found. Forbidden links are likely to make ecological communities less robust to species extinctions, stressing the need to assess their prevalence. Here, we used a dataset of plant-hummingbird interactions, coupled with a Bayesian hierarchical model, to assess the importance of exploitation barriers in determining species interactions. We found evidence for exploitation barriers between flowers and hummingbirds across the 32 studied communities, however, the proportion of forbidden links changed drastically among communities, because of changes in trait distributions. The higher the proportion of forbidden links, the more they decreased network robustness, because of constraints on interaction rewiring. Our results suggest that exploitation barriers are not rare in plant-hummingbird communities and have the potential to limit the rescue of species experiencing partner extinction.