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The present study is a synopsis of the species of Myrcia occurring in Pernambuco, Brazil. We recorded 30 species distributed in eight sections: M. sect. Aguava (4), Myrcia sect. Aulomyrcia (9), M. sect. Calyptranthes (3), M. sect. Gomidesia (5), M. sect. Myrcia (4), M. sect. Reticulosae (2), M. sect. Sympodiomyrcia (2) and M. sect. Tomentosae (1), beyond Myrcia sp. which has not been included in any section yet. Myrcia laricina (O. Berg) Burret ex Luetzelb. and M. hirtiflora DC. are new records for the State. Myrcia arenaria had the first record for humid forest in the municipality of Brejo da Madre de Deus. This study provides an identification key, comments on morphological distinction, geographic distribution and habitat for all taxa. In addition, distribution maps, photographic plates with the distinctive characteristics of the species are included and the updating names of Calyptranthes, Gomidesia and Marlierea under Myrcia. [ABSTRACT FROM AUTHOR]

Biological invasions have been identified as the fifth cause of biodiversity loss, and their subsequent dispersal represents a major ecological challenge. The aquatic invasive species Ludwigia grandiflora subsp. hexapetala (Lgh) and Ludwigia peploides subsp. montevidensis (Lpm) are largely distributed in aquatic environments in North America and in Europe. However, they also present worrying terrestrial forms that are able to colonize wet meadows. To comprehend the mechanisms of the terrestrial adaptation of Lgh and Lpm, it is necessary to develop their genomic resources, which are currently poorly documented. We performed de novo assembly of the mitogenomes of Lgh and Lpm through hybrid assemblies, combining short reads (SR) and/or long reads (LR) before annotating both mitogenomes. We successfully assembled the mitogenomes of Lgh and Lpm into two circular molecules each, resulting in a combined total length of 711,578 bp and 722,518 bp, respectively. Notably, both the Lgh and Lpm molecules contained plastome-origin sequences, comprising 7.8% of the mitochondrial genome length. Additionally, we identified recombinations that were mediated by large repeats, suggesting the presence of multiple alternative conformations. In conclusion, our study presents the first high-quality mitogenomes of Lpm and Lgh, which are the only ones in the Myrtales order found as two circular molecules. [ABSTRACT FROM AUTHOR]

This study describes Siphoneugena carolynae (Myrtaceae), a new species from the Brazilian Atlantic Forest, in the state of Rio de Janeiro. The species inhabits inselberg forests and differs from all other species of Siphoneugena by the following exclusive combination of morphological characters: relatively long petioles, leaf blades chartaceous with midvein canaliculate adaxially, inflorescences in racemes with a markedly compressed and indistinguishable main axis, hypanthium markedly constricted above the ovary, calyx calyptrate, ovaries with two locules, each with four ovules, and cotyledons densely covered with foveolate glands. We herein provide taxonomic notes, morphological plates (derived from both fresh and dried material), and a distribution map. Regarding the conservation status, the new species is preliminarily assessed as Data Deficient (DD), but comments on population size and possible threats to the habitat are presented. [ABSTRACT FROM AUTHOR]

A new species of Syzygium (Myrtaceae) from Carranglan, Nueva Ecija, Luzon, Philippines – Syzygium crystalliferum is described and illustrated here as species new to science. Syzygium crystalliferum is similar to S. purpuriflorum by having sessile leaves, cordate base, terminal inflorescence, large flowers and free perianth lobes. However, it is unique in pustules in dried leaves and inflorescence, and having chartaceous‐coriaceous leaf texture, coarser secondary leaf venation, individual flowers borne on a distinct pedicel, shorter hypanthium, smaller calyx lobes, and red fruit turning deep purple when ripe. Preliminary assessment of conservation status following IUCN guidelines assign S. crystalliferum as Critically Endangered (CR). This discovery makes the first addition to Philippine Syzygium in over 70 years since Elmer D. Merrill's last taxonomic work on the genus. Additionally, a lectotype for the basionym Eugenia purpuriflora is designated. [ABSTRACT FROM AUTHOR]

Auxin Response Factors (ARFs) mediate auxin signaling and govern diverse biological processes. However, a comprehensive analysis of the ARF gene family and identification of their key regulatory functions have not been conducted in Melastoma dodecandrum, leading to a weak understanding of further use and development for this functional shrub. In this study, we successfully identified a total of 27 members of the ARF gene family in M. dodecandrum and classified them into Class I–III. Class II–III showed more significant gene duplication than Class I, especially for MedARF16s. According to the prediction of cis-regulatory elements, the AP2/ERF, BHLH, and bZIP transcription factor families may serve as regulatory factors controlling the transcriptional pre-initiation expression of MedARF. Analysis of miRNA editing sites reveals that miR160 may play a regulatory role in the post-transcriptional expression of MeARF. Expression profiles revealed that more than half of the MedARFs exhibited high expression levels in the stem compared to other organs. While there are some specific genes expressed only in flowers, it is noteworthy that MedARF16s, MedARF7A, and MedARF9B, which are highly expressed in stems, also demonstrate high expressions in other organs of M. dodecandrum. Further hormone treatment experiments revealed that these MedARFs were sensitive to auxin changes, with MedARF6C and MedARF7A showing significant and rapid changes in expression upon increasing exogenous auxin. In brief, our findings suggest a crucial role in regulating plant growth and development in M. dodecandrum by responding to changes in auxin. These results can provide a theoretical basis for future molecular breeding in Myrtaceae. [ABSTRACT FROM AUTHOR]

We present a genome assembly from an individual Chamaenerion angustifolium (fireweed; Tracheophyta; Magnoliopsida; Myrtales; Onagraceae). The genome sequence is 655.9 megabases in span. Most of the assembly is scaffolded into 18 chromosomal pseudomolecules. The mitochondrial and plastid genome assemblies have lengths of 495.18 kilobases and 160.41 kilobases in length, respectively.

Biological invasions have been identified as the fifth cause of biodiversity loss, and their subsequent dispersal represents a major ecological challenge. The aquatic invasive species Ludwigia grandiflora subsp. hexapetala (Lgh) and Ludwigia peploides subsp. montevidensis (Lpm) are largely distributed in aquatic environments in North America and in Europe. However, they also present worrying terrestrial forms that are able to colonize wet meadows. To comprehend the mechanisms of the terrestrial adaptation of Lgh and Lpm, it is necessary to develop their genomic resources, which are currently poorly documented. We performed de novo assembly of the mitogenomes of Lgh and Lpm through hybrid assemblies, combining short reads (SR) and/or long reads (LR) before annotating both mitogenomes. We successfully assembled the mitogenomes of Lgh and Lpm into two circular molecules each, resulting in a combined total length of 711,578 bp and 722,518 bp, respectively. Notably, both the Lgh and Lpm molecules contained plastome-origin sequences, comprising 7.8% of the mitochondrial genome length. Additionally, we identified recombinations that were mediated by large repeats, suggesting the presence of multiple alternative conformations. In conclusion, our study presents the first high-quality mitogenomes of Lpm and Lgh, which are the only ones in the Myrtales order found as two circular molecules.

This article deals with the aphids infesting plants belonging to the clade malvids that includes 5 orders of eudicot angiosperms in India which are associated with aphids. This clade includes several highly economically important fruit trees (cashew, pistachio, mango, litchi, neem, lemon, orange, papaya, pomegranate, guava, jamun etc.), vegetable crops (cabbage, cauliflower, kale, radish etc.), oil seeds (mustard), textile fibres (jute, cotton), spices (cloves), medicinal plants (arjuna), essential oils (eucalyptus) etc. A total of 150 species of aphids belonging to 71 genera and 11 subfamilies were recorded to infest 172 species of this clade of flowering plants belonging to 105 genera, 21 families and 5 orders. Most of the aphids belong to the subfamily Aphidinae (38 genera, 80 species) and tribe Macrosiphini (36 genera, 54 species) followed by Greenideinae (6 genera, 23 species) and tribe Greenideini (3 genera, 20 species). Greenideinae are mostly associated with the family Myrtaceae. The maximum number of species of aphids utilise the plants belonging to the family Malvaceae (36 species of 22 genera) followed by Brassicaceae (23 species of 15 genera), Rutaceae (19 species of 10 genera), Anacardiaceae (15 species of 10 genera), Lythraceae (11 species of 8 genera), and Sapindaceae (11 species, of 5 genera), Myrtaceae (10 species of 5 genera) and remaining 14 families having less than 10 species of plants associated with aphids.

Summary: This study proposes Myrciaria caerulescens as a new species from the Espinhaço Range, in the northeastern Brazilian state of Bahia. The new taxon is a fruiting species that has been cultivated among Brazilian horticulturists since 2018 and has been misidentified as M. guaquiea in herbaria over the last two decades. This study provides the morphological description of the new taxon along with taxonomic notes, a distribution map, a morphological plate and preliminary conservation status. We also confirm that M. guaquiea, also commonly cultivated and previously reported for the state of Bahia, actually occurs exclusively in the Brazilian state of Rio de Janeiro. A brief historical assessment regarding the cultivation of M. guaquiea in Brazil is presented. [ABSTRACT FROM AUTHOR]

Abstract This study aimed to carry out a floristic-taxonomic survey of the Lythraceae representatives, as part of the project “Flora do Ceará: knowing to conserve”. The data were obtained via the morphologicals analysis of samples collected in the field, and collections in herbaria as well as in specialized bibliographies. In the state of Ceará, Lythraceae is represented by 15 species belonging to four genera: Ammannia (2); Cuphea (9), Lafoensia (3) and Pleurophora (1). The species were recorded in different phytophysiognomies, but they occur preferentially in the Steppic Savanna (Caatinga and/or Carrasco), in the Dense Ombrophilous Forest (Wet Forest) and in the Vegetation Complex of the Coastal Zone (Dunes and Lowland Semideciduous Forests). The taxon with the highest number of records was Cuphea campestris, which ocurrs in 26 municipalities. Eight species were recorded in ten conservation units in Ceará. Four species are endemic to the northeastern region: Cuphea campestris, C. laricoides, C. loefgrenii and Lafoensia glyptocarpa. Lafoensia glyptocarpa and L. pacari are new records for Ceará. The identification key, morphological descriptions, comments on distribution, ecology, phenology, uses, maps, and species illustrations are presented.

Herbal drugs are one of the very well-known medicines adapted by millions of people worldwide since ancient time. The plant kingdom is a treasure of potential phytochemicals that can be utilized to treat variety of medical conditions. With the advent of increase in demand and knowledge of herbal medicines quality of these herbal medicines has grab the attention of various pharma industries. Thus, certain standard parameters to determine the quality of raw material are described in the present article. In the current study the quality of raw material 16 members of order Myrtales constituting 5 families i.e. Myrtaceae, Lythraceae, Lecythidaceae, Melastomataceae and Combretaceae from different regions of Maharashtra were carried out. Allied variety of plants from the region of Mumbai and Lonavala were considered for the study. Physicochemical parameters such as Moisture content, Total Ash Value, Acid soluble Ash, and Water-soluble Ash were determined. Values of proximate analysis of raw material were found to be within permissible limit as specified in pharmacopeia. [ABSTRACT FROM AUTHOR]

Several parts of rose myrtle, Rhodomyrtus tomentosa, exhibited profound antibacterial and anti-inflammatory activities, suggesting its potential in healthcare and cosmetics applications. During the past few years, the demand for biologically active compounds in the industrial sectors increased. Therefore, gathering comprehensive information on all aspects of this plant species is essential. Here, the genome sequencing using short and long reads was used to understand the genome biology of R. tomentosa. Inter-simple sequence repeats (ISSR) and simple sequence repeats (SSR) markers, and geometric morphometrics of the leaves of R. tomentosa collected across Thai Peninsula, were determined for population differentiation analysis. The genome size of R. tomentosa was 442 Mb, and the divergence time between R. tomentosa and Rhodamnia argentea, the white myrtle of eastern Australia, was around 15 million years. No population structure was observed between R. tomentosa on the eastern and western sides of the Thai Peninsula using the ISSR and SSR markers. However, significant differences in leaf size and shape of R. tomentosa were observed in all locations. [ABSTRACT FROM AUTHOR]

Auxin Response Factors (ARFs) mediate auxin signaling and govern diverse biological processes. However, a comprehensive analysis of the ARF gene family and identification of their key regulatory functions have not been conducted in Melastoma dodecandrum, leading to a weak understanding of further use and development for this functional shrub. In this study, we successfully identified a total of 27 members of the ARF gene family in M. dodecandrum and classified them into Class I–III. Class II–III showed more significant gene duplication than Class I, especially for MedARF16s. According to the prediction of cis-regulatory elements, the AP2/ERF, BHLH, and bZIP transcription factor families may serve as regulatory factors controlling the transcriptional pre-initiation expression of MedARF. Analysis of miRNA editing sites reveals that miR160 may play a regulatory role in the post-transcriptional expression of MeARF. Expression profiles revealed that more than half of the MedARFs exhibited high expression levels in the stem compared to other organs. While there are some specific genes expressed only in flowers, it is noteworthy that MedARF16s, MedARF7A, and MedARF9B, which are highly expressed in stems, also demonstrate high expressions in other organs of M. dodecandrum. Further hormone treatment experiments revealed that these MedARFs were sensitive to auxin changes, with MedARF6C and MedARF7A showing significant and rapid changes in expression upon increasing exogenous auxin. In brief, our findings suggest a crucial role in regulating plant growth and development in M. dodecandrum by responding to changes in auxin. These results can provide a theoretical basis for future molecular breeding in Myrtaceae.

The recent availability of open‐access repositories of functional traits has revolutionized trait‐based approaches in ecology and evolution. Nevertheless, the underrepresentation of tropical regions and lineages remains a pervasive bias in plant functional trait databases, which constrains large‐scale assessments of plant ecology, evolution, and biogeography. Here, we present MelastomaTRAITs 1.0, a comprehensive and updatable database of functional traits for the pantropical Melastomataceae, the ninth‐largest angiosperm family with 177 genera and more than 5800 species. Melastomataceae encompass species with a wide diversity of growth forms (herbs, shrubs, trees, epiphytes, and woody climbers), habitats (including tropical forests, savannas, grasslands, and wetlands from sea level to montane areas above the treeline), ecological strategies (from pioneer, edge‐adapted and invasive species to shade‐tolerant understory species), geographic distribution (from microendemic to continental‐wide distribution), reproductive, pollination, and seed dispersal systems. MelastomaTRAITs builds on 581 references, such as taxonomic monographs, ecological research, and unpublished data, and includes four whole‐plant traits, six leaf traits, 11 flower traits, 18 fruit traits, and 27 seed traits for 2520 species distributed in 144 genera across all 21 tribes. Most data come from the Neotropics where the family is most species‐rich. Miconieae (the largest tribe) contains the highest number of trait records (49.6%) and species (41.1%) records. The trait types with the most information in the database were whole‐plant traits, flowers, and leaf traits. With the breadth of functional traits recorded, our database helps to fill a gap in information for tropical plants and will significantly improve our capacity for large‐scale trait‐based syntheses across levels of organization, plant–animal interactions, regeneration ecology, and thereby support conservation and restoration programs. There are no copyright restrictions on the dataset; please cite this data paper when reusing the data. [ABSTRACT FROM AUTHOR]

This study aimed to carry out a floristic-taxonomic survey of the Lythraceae representatives, as part of the project "Flora do Ceará: knowing to conserve". The data were obtained via the morphologicals analysis of samples collected in the field, and collections in herbaria as well as in specialized bibliographies. In the state of Ceará, Lythraceae is represented by 15 species belonging to four genera: Ammannia (2); Cuphea (9), Lafoensia (3) and Pleurophora (1). The species were recorded in different phytophysiognomies, but they occur preferentially in the Steppic Savanna (Caatinga and/or Carrasco), in the Dense Ombrophilous Forest (Wet Forest) and in the Vegetation Complex of the Coastal Zone (Dunes and Lowland Semideciduous Forests). The taxon with the highest number of records was Cuphea campestris, which ocurrs in 26 municipalities. Eight species were recorded in ten conservation units in Ceará. Four species are endemic to the northeastern region: Cuphea campestris, C. laricoides, C. loefgrenii and Lafoensia glyptocarpa. Lafoensia glyptocarpa and L. pacari are new records for Ceará. The identification key, morphological descriptions, comments on distribution, ecology, phenology, uses, maps, and species illustrations are presented. [ABSTRACT FROM AUTHOR]

Melastomataceae é uma das famílias mais representativas do Cerrado, apresentando 33 gêneros e 513 espécies no bioma. A última listagem publicada de Melastomataceae para o Distrito Federal (DF) apontava 19 gêneros e 87 espécies, e foi elaborada para nortear o projeto Flora do Distrito Federal em 2001. Desde então, novos estudos moleculares trouxeram muitas mudanças de circunscrição genérica e tribal, por isso a importância de atualizar o tratamento taxonômico da família para o DF. O presente Conspectus apresenta uma chave dicotômica abrangendo 18 gêneros e 89 espécies de Melastomataceae com ocorrência confirmada no DF. É fornecida uma listagem com o habitat, cor da corola, número de registros no DF e habitats mais comumente registrados para cada espécie, além de imagens de 20 espécies.

Abstract Terminalia L. has a pantropical distribution, almost exclusively constituting tropical Combretaceae. In this work, a comprehensive synopsis of all the native species of Terminalia s.s. in the Brazilian Amazon is presented, including diagnostic characters, identification key, illustrations, geographic distribution maps, diversity and richness patterns with a new occurrence in Brazil, and a table with conservation status and number of records/ protected areas and their protected areas for all species. This information seeks to support the identification of these tree species, in addition to actions to conserve trees in the Brazilian Amazon.

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Abstract Background Myrtales is a species rich branch of Rosidae, with many species having important economic, medicinal, and ornamental value. At present, although there are reports on the chloroplast structure of Myrtales, a comprehensive analysis of the chloroplast structure of Myrtales is lacking. Phylogenetic and divergence time estimates of Myrtales are mostly constructed by using chloroplast gene fragments, and the support for relationships is low. A more reliable method to reconstruct the species divergence time and phylogenetic relationships is by using whole chloroplast genomes. In this study, we comprehensively analyzed the structural characteristics of Myrtales chloroplasts, compared variation hotspots, and reconstructed the species differentiation time of Myrtales with four fossils and one secondary calibration point. Results A total of 92 chloroplast sequences of Myrtales, representing six families, 16 subfamilies and 78 genera, were obtained including nine newly sequenced chloroplasts by whole genome sequencing. Structural analyses showed that the chloroplasts range in size between 152,214–171,315 bp and exhibit a typical four part structure. The IR region is between 23,901–36,747 bp, with the large single copy region spanning 83,691–91,249 bp and the small single copy region spanning 11,150–19,703 bp. In total, 123–133 genes are present in the chloroplasts including 77–81 protein coding genes, four rRNA genes and 30–31 tRNA genes. The GC content was 36.9–38.9%, with the average GC content being 37%. The GC content in the LSC, SSC and IR regions was 34.7–37.3%, 30.6–36.8% and 39.7–43.5%, respectively. By analyzing nucleotide polymorphism of the chloroplast, we propose 21 hypervariable regions as potential DNA barcode regions for Myrtales. Phylogenetic analyses showed that Myrtales and its corresponding families are monophyletic, with Combretaceae and the clade of Onagraceae + Lythraceae (BS = 100%, PP = 1) being sister groups. The results of molecular dating showed that the crown of Myrtales was most likely to be 104.90 Ma (95% HPD = 87.88–114.18 Ma), and differentiated from the Geraniales around 111.59 Ma (95% HPD = 95.50–118.62 Ma). Conclusions The chloroplast genome structure of Myrtales is similar to other angiosperms and has a typical four part structure. Due to the expansion and contraction of the IR region, the chloroplast genome sizes in this group are slightly different. The variation of noncoding regions of the chloroplast genome is larger than those of coding regions. Phylogenetic analysis showed that Combretaceae and Onagraceae + Lythraceae were well supported as sister groups. Molecular dating indicates that the Myrtales crown most likely originated during the Albian age of the Lower Cretaceous. These chloroplast genomes contribute to the study of genetic diversity and species evolution of Myrtales, while providing useful information for taxonomic and phylogenetic studies of Myrtales.

• Complete Rhodomyrtus tomentosa mitochondrial genome (400,482 bp) unveiled. • Nanopore ONT reads and PCR reveal repeat-mediated recombination in the genome. • PCR amplification confirms existence of sequences from intracellular gene transfer. • R. tomentosa consistently clusters with Myrtaceae species in Myrtales phylogeny based on mitochondrial genome sequences. Plant mitochondrial genomes participate in encoding proteins crucial to the major producers of ATP in the cell and replication and heredity of their own DNA. The sequences and structure of the plant mitochondrial genomes profoundly impact these fundamental processes, and studies of plant mitochondrial genomes are needed. We reported the complete sequences of the Rhodomyrtus tomentosa mitochondrial genome here, totaling 400,482 bp. Nanopore ONT reads and PCR amplification provided evidence for recombination mediated by the eight repeat pairs for the R. tomentosa mitochondrial genome. Thirty-eight genes were identified in the R. tomentosa mitochondrial genome. Comparative analyses of the mitochondrial genome and plastome and PCR amplification suggest that five fragments of mitochondrial plastid DNA were unfunctional sequences resulting from intracellular gene transfer. Phylogenetic analysis based on each and all of the 27 mitochondrial protein-coding genes of nine Myrtales species revealed that R. tomentosa always clustered with other species of Myrtaceae. This study uncovered the enormous complexity of the R. tomentosa mitochondrial genome, the active repeat-mediated recombinations, the presence of mitochondrial plastid DNAs, and the topological incongruence of Myrtales among the single-gene trees. [ABSTRACT FROM AUTHOR]

Several parts of rose myrtle, Rhodomyrtus tomentosa, exhibited profound antibacterial and anti-inflammatory activities, suggesting its potential in healthcare and cosmetics applications. During the past few years, the demand for biologically active compounds in the industrial sectors increased. Therefore, gathering comprehensive information on all aspects of this plant species is essential. Here, the genome sequencing using short and long reads was used to understand the genome biology of R. tomentosa. Inter-simple sequence repeats (ISSR) and simple sequence repeats (SSR) markers, and geometric morphometrics of the leaves of R. tomentosa collected across Thai Peninsula, were determined for population differentiation analysis. The genome size of R. tomentosa was 442 Mb, and the divergence time between R. tomentosa and Rhodamnia argentea, the white myrtle of eastern Australia, was around 15 million years. No population structure was observed between R. tomentosa on the eastern and western sides of the Thai Peninsula using the ISSR and SSR markers. However, significant differences in leaf size and shape of R. tomentosa were observed in all locations.

Abstract Melastomataceae are the tenth most diverse angiosperm family in the world and the sixth largest angiosperm family in Brazil. Among the ecosystems associated with the Atlantic Forest, restinga comprises different phytophysiognomies where this family is a conspicuous element. Parque Estadual Paulo César Vinha (PEPCV) is an important area of restinga with various phytophysiognomies and serves as an interesting model for taxonomic studies about Melastomataceae. Thus, from October 2017 to April 2019, we conducted a taxonomic study of the family in this protected area and made ecological observations that have never been discussed for the group in this environment. We recorded 14 species and a preference for open, humid areas. The richest genera were Miconia and Pleroma. In addition to morphological and habitats information, we recorded three new occurrences for this protected area.

Melastomataceae are the tenth most diverse angiosperm family in the world and the sixth largest angiosperm family in Brazil. Among the ecosystems associated with the Atlantic Forest, restinga comprises different phytophysiognomies where this family is a conspicuous element. Parque Estadual Paulo César Vinha (PEPCV) is an important area of restinga with various phytophysiognomies and serves as an interesting model for taxonomic studies about Melastomataceae. Thus, from October 2017 to April 2019, we conducted a taxonomic study of the family in this protected area and made ecological observations that have never been discussed for the group in this environment. We recorded 14 species and a preference for open, humid areas. The richest genera were Miconia and Pleroma. In addition to morphological and habitats information, we recorded three new occurrences for this protected area. [ABSTRACT FROM AUTHOR]

RESUMO Este estudo teve como objetivo realizar um levantamento florístico das espécies de Myrtaceae ocorrentes dentro dos limites do Monumento Natural Municipal da Lagoa do Peri, estado de Santa Catarina, Brasil. Para tal, foram realizadas quatro expedições a campo, entre os meses de novembro de 2017 a outubro de 2018. Espécimes da Lagoa do Peri, depositados nos herbários FLOR, FURB, MBM e PACA, e material coletado nas expedições de campo foram analisados. Para identificação das espécies foram utilizadas bibliografias especializadas, imagens depositadas em herbários virtuais e consulta online aos tipos e protólogos. Um total de 25 espécies nativas, pertencentes a seis gêneros, foi registrado, sendo Eugenia o gênero mais abundante (10 spp.), seguido por Myrcia (nove spp.), Campomanesia (duas spp.), Myrciaria (duas spp.), Plinia e Psidium (uma sp. cada). Syzygium cumini, Psidium guajava e Eucalyptus sp. são espécies introduzidas avistadas no local de estudo. Chaves de identificação, descrições, fotos e comentários sobre as espécies encontradas são apresentados.

Syzygiumkampotense is a new species from Cambodia. Syzygiumcerasiforme , S.foxworthianum , and S.angkae and S.thorelii are new records from Cambodia, Vietnam and China, respectively. Syzygiumprainianumsubsp.minor and S.densinerviumvar.insulare are placed under S.prainianum and S.densinervium , respectively. Eugeniacochinchinensis , E.eburnea and E.ripicola , are reduced to synonymy under S.pellucidum . Lectotypes for Eugeniadensifloravar.angustifolia, E.pellucida and E.pellucidavar.contracta are designated., Competing Interests: The author has declared that no competing interests exist., (Pranom Chantaranothai.)

Background: Myrtales is a species rich branch of Rosidae, with many species having important economic, medicinal, and ornamental value. At present, although there are reports on the chloroplast structure of Myrtales, a comprehensive analysis of the chloroplast structure of Myrtales is lacking. Phylogenetic and divergence time estimates of Myrtales are mostly constructed by using chloroplast gene fragments, and the support for relationships is low. A more reliable method to reconstruct the species divergence time and phylogenetic relationships is by using whole chloroplast genomes. In this study, we comprehensively analyzed the structural characteristics of Myrtales chloroplasts, compared variation hotspots, and reconstructed the species differentiation time of Myrtales with four fossils and one secondary calibration point. Results: A total of 92 chloroplast sequences of Myrtales, representing six families, 16 subfamilies and 78 genera, were obtained including nine newly sequenced chloroplasts by whole genome sequencing. Structural analyses showed that the chloroplasts range in size between 152,214–171,315 bp and exhibit a typical four part structure. The IR region is between 23,901–36,747 bp, with the large single copy region spanning 83,691–91,249 bp and the small single copy region spanning 11,150–19,703 bp. In total, 123–133 genes are present in the chloroplasts including 77–81 protein coding genes, four rRNA genes and 30–31 tRNA genes. The GC content was 36.9–38.9%, with the average GC content being 37%. The GC content in the LSC, SSC and IR regions was 34.7–37.3%, 30.6–36.8% and 39.7–43.5%, respectively. By analyzing nucleotide polymorphism of the chloroplast, we propose 21 hypervariable regions as potential DNA barcode regions for Myrtales. Phylogenetic analyses showed that Myrtales and its corresponding families are monophyletic, with Combretaceae and the clade of Onagraceae + Lythraceae (BS = 100%, PP = 1) being sister groups. The results of molecular dating showed that the crown of Myrtales was most likely to be 104.90 Ma (95% HPD = 87.88–114.18 Ma), and differentiated from the Geraniales around 111.59 Ma (95% HPD = 95.50–118.62 Ma). Conclusions: The chloroplast genome structure of Myrtales is similar to other angiosperms and has a typical four part structure. Due to the expansion and contraction of the IR region, the chloroplast genome sizes in this group are slightly different. The variation of noncoding regions of the chloroplast genome is larger than those of coding regions. Phylogenetic analysis showed that Combretaceae and Onagraceae + Lythraceae were well supported as sister groups. Molecular dating indicates that the Myrtales crown most likely originated during the Albian age of the Lower Cretaceous. These chloroplast genomes contribute to the study of genetic diversity and species evolution of Myrtales, while providing useful information for taxonomic and phylogenetic studies of Myrtales. [ABSTRACT FROM AUTHOR]

Abstract Background Lythraceae belongs to the order Myrtales, which is part of Archichlamydeae. The family has 31 genera containing approximately 620 species of herbs, shrubs and trees. Of these 31 genera, five large genera each possess 35 or more species. They are Lythrum, with 35; Rotala, with 45; Nesaea, with 50; Lagerstroemia, with 56; and Cuphea, with 275 species. Results We reported six newly sequenced chloroplast (cp) genomes (Duabanga grandiflora, Trapa natans, Lythrum salicaria, Lawsonia inermis, Woodfordia fruticosa and Rotala rotundifolia) and compared them with 16 other cp genomes of Lythraceae species. The cp genomes of the 22 Lythraceae species ranged in length from 152,049 bp to 160,769 bp. In each Lythraceae species, the cp genome contained 112 genes consisting of 78 protein coding genes, four ribosomal RNAs and 30 transfer RNAs. Furthermore, we detected 211–332 simple sequence repeats (SSRs) in six categories and 7–27 long repeats in four categories. We selected ten divergent hotspots (ndhF, matK, ycf1, rpl22, rpl32, trnK-rps16, trnR-atpA, rpl32-trnL, trnH-psbA and trnG-trnR) among the 22 Lythraceae species to be potential molecular markers. We constructed phylogenetic trees from 42 Myrtales plants with 8 Geraniales plants as out groups. The relationships among the Myrtales species were effectively distinguished by maximum likelihood (ML), maximum parsimony (MP) and Bayesian inference (BI) trees constructed using 66 protein coding genes. Generally, the 22 Lythraceae species gathered into one clade, which was resolved as sister to the three Onagraceae species. Compared with Melastomataceae and Myrtaceae, Lythraceae and Onagraceae differentiated later within Myrtales. Conclusions The study provided ten potential molecular markers as candidate DNA barcodes and contributed cp genome resources within Myrtales for further study.

Abstract This study aimed to provide the floristic survey of Onagraceae in Ceará state. The floristic study consisted of analyzing material deposited in the herbaria EAC, ESA, FUEL, HCDAL, HUEFS, HUVA, HVASF, INPA, K, MO, NY, P, RB, UFRN and US, as well as field work carried out between 2015 and 2017. In the study area, Onagraceae is represented by the genus Ludwigia, and seven species were recorded: L. erecta, L. helminthorrhiza, L. hyssopifolia, L. leptocarpa, L. nervosa, L. octovalvis and L. tomentosa. All seven species were also sampled in Conservation Units, with L. erecta recorded in six of them. L. erecta and L. helminthorrhiza have a broader distribution in the state. L. nervosa and L. tomentosa are indicated as new occurrences for Ceará, both with only one record in the south of the state, expanding their range in Northeastern Brazil. The information in this manuscript allows identification of Onagraceae representatives in Ceará state, through morphological descriptions, identification keys, taxonomic comments, illustrations, photographs and geographic distribution data.

Abstract We present the floristic treatment of the Terminalia species occurring in the state of Maranhão. This study was based on the analysis of national and international herbaria. Six species were recorded from the state: Terminalia actinophylla, T. amazonia, T. dichotoma, T. fagifolia, T. glabrescens, and T. lucida, with one endemic (T. actinophylla) to Brazil. Taxa were commonly recorded in dry Savanna environments (cerrado). Only the species Terminalia fagifolia and T. lucida occur in conservation units in Maranhão, specifically in Mirador State Park, Chapada das Mesas National Park and Ecological Sanctuary of Pedra Caída. In addition to morphological descriptions, this study includes an identification key, illustrations, and comments about taxonomic affinities, geographical distribution, ecology, conservation status, and phenology of the species.

Resumo Este trabalho apresenta o tratamento florístico-taxonômico para as espécies de Terminalia ocorrentes no estado do Piauí. O estudo foi baseado em análise de exsicatas depositadas em herbários nacionais e internacionais, bem como em observações realizadas em campo. Para o estado foram registradas sete espécies: Terminalia actinophylla, T. amazonia, T. argentea, T. eichleriana, T. fagifolia, T. glabrescens e T. lucida, sendo duas endêmicas do Brasil. Os táxons foram registrados, em geral, em ambientes secos de Savana (cerrado) e Savana estépica (caatinga). Destaca-se, ainda, que 57% (4 spp.) das espécies de Terminalia ocorrem em unidades de conservação do Piauí. O estudo fornece descrições morfológicas, chave de identificação, prancha fotográfica, ilustrações e comentários sobre as espécies.

This study aimed to provide the floristic survey of Onagraceae in Ceará state. The floristic study consisted of analyzing material deposited in the herbaria EAC, ESA, FUEL, HCDAL, HUEFS, HUVA, HVASF, INPA, K, MO, NY, P, RB, UFRN and US, as well as field work carried out between 2015 and 2017. In the study area, Onagraceae is represented by the genus Ludwigia, and seven species were recorded: L. erecta, L. helminthorrhiza, L. hyssopifolia, L. leptocarpa, L. nervosa, L. octovalvis and L. tomentosa. All seven species were also sampled in Conservation Units, with L. erecta recorded in six of them. L. erecta and L. helminthorrhiza have a broader distribution in the state. L. nervosa and L. tomentosa are indicated as new occurrences for Ceará, both with only one record in the south of the state, expanding their range in Northeastern Brazil. The information in this manuscript allows identification of Onagraceae representatives in Ceará state, through morphological descriptions, identification keys, taxonomic comments, illustrations, photographs and geographic distribution data. [ABSTRACT FROM AUTHOR]

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Terminalia argentea Mart. (Combretaceae), native to Brazil, is used in habitat restoration programs. Arthropods are bioindicators because their populations reflect changes in the environment. We evaluated the recovery of a degraded area by using ecological indices and analyzing arthropod interactions on T. argentea plants. The richness and diversity of sap-sucking Hemiptera and the abundance of tending ants and Sternorrhyncha predators increased with the number of T. argentea leaves. The correlation of the abundance of tending ants and Sternorrhyncha predators was positive with that of the sap-sucking Hemiptera, and the abundance of Sternorrhyncha predators was negative with that of tending ants and sap-sucking Hemiptera. The positive correlation between the abundance, richness, and diversity of insect groups and numbers of T. argentea leaves is an example of the bottom-up regulation mechanism, with the population dynamics of the lower trophic levels dictating those of higher trophic levels. The contribution of T. argentea, a host plant of many arthropods, to the recovery of ecological relationships between organisms in degraded ecosystems is important., (© The Author(s) 2024. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)

We present a genome assembly from an individual Chamaenerion angustifolium (fireweed; Tracheophyta; Magnoliopsida; Myrtales; Onagraceae). The genome sequence is 655.9 megabases in span. Most of the assembly is scaffolded into 18 chromosomal pseudomolecules. The mitochondrial and plastid genome assemblies have lengths of 495.18 kilobases and 160.41 kilobases in length, respectively., Competing Interests: No competing interests were disclosed., (Copyright: © 2024 Christenhusz MJM et al.)

Syzygium jambos (Myrtales, Myrtaceae) trees in Hawaii are severely affected by a rust disease caused by Austropuccinia psidii (Pucciniales, Sphaerophragmiaceae), but they are commonly co-infected with species of Cryphonectriaceae (Diaporthales). In this study, S. jambos and other trees in the Myrtales were examined on three Hawaiian Islands for the presence of Cryphonectriaceae. Bark samples with fruiting bodies were collected from infected trees and fungi were isolated directly from these structures. Pure cultures were produced and the fungi were identified using DNA sequence data for the internal transcribed spacer (ITS) region, part of the β-tubulin (BT1) gene and the transcription elongation factor-1α (TEF1) gene. Five species in three genera of Cryphonectriaceae were identified from Myrtaceae tree samples. These included Chrysoporthe deuterocubensis, Microthia havanensis and three previously-unknown taxa described here as Celoporthe hauoliensis sp. nov., Cel. hawaiiensis sp. nov. and Cel. paradisiaca sp. nov. Representative isolates of Cel. hauoliensis, Cel. hawaiiensis, Cel. paradisiaca, Chr. deuterocubensis and Mic. havanensis were used in artificial inoculation studies to consider their pathogenicity on S. jambos. Celoporthe hawaiiensis, Cel. paradisiaca and Chr. deuterocubensis produced lesions on young S. jambos trees in inoculation trials, suggesting that, together with A. psidii, they may contribute to the death of trees. Microsatellite markers were subsequently used to consider the diversity of Chr. deuterocubensis on the Islands and thus to gain insights into its possible origin in Hawaii. Isolates of this important Myrtaceae and particularly Eucalyptus pathogen were found to be clonal. This provides evidence that Chr. deuterocubensis was introduced to the Hawaiian Islands as a single introduction, from a currently unknown source. [ABSTRACT FROM AUTHOR]

RESUMO (Microlicia D. Don (Microlicieae, Melastomataceae) no Parque Nacional da Chapada dos Veadeiros, Estado de Goiás, Brasil). Microlicia D. Don compreende 170 espécies, 150 das quais presentes no Brasil, sendo 149 delas endêmicas. O conhecimento taxonômico desse gênero na região Centro-Oeste do país é precário. É apresentado o tratamento taxonômico de Microlicia no Parque Nacional da Chapada dos Veadeiros, Goiás, Brasil, o qual resultou de 24 coletas mensais com duração de três a cinco dias durante o período de 2014 a 2016. Foram registradas 18 espécies, sendo quatro estabelecidas durante os estudos desse grupo de pesquisa e já publicadas (M. chrysoglandulosa R. Romero, Versiane, Fontelas & D.O. Diniz-Neres, M. veadeirana D.O. Diniz-Neres & M. J. Silva, M. latifolia D.O. Diniz & M.J. Silva e M. stenodonoides D.O. Diniz-Neres & M.J. Silva), uma nova ocorrência para Goiás (M. scoparia DC.), duas espécies (M. crebropunctata Pilg. e M. melanostagma Pilg.) são consideradas raras, e as demais comuns aos Estados de Goiás e Minas Gerais. São apresentadas chave de identificação, descrições com comentários sobre distribuição, épocas de floração e frutificação, comparações morfológicas, ilustrações para os táxons, bem como fotografias para a maioria deles. A partir deste estudo o gênero passa de 19 para 24 espécies no Estado de Goiás.

The association of the ant Myrcidris epicharis with the plant Myrcia magna is reported for the first time. This association was registered in two localities along the Negro river basin, in the region of Manaus, Amazonas state, Brazil. The ants inhabit swollen shoots in apical and subjacent nodes of the branches. This record represents the second plant species of Myrtaceae to be associated with Myrcidris epicharis.

A new species of Eugenia from the Atlantic forest of Brazil is described and illustrated. Eugenia flavicarpa is restricted to the Floresta de Tabuleiro (lowland forests) of Espírito Santo state and is nested in Eugenia subg. Pseudeugenia. Considering all other species of the subgenus that occur in forest vegetation types of the Atlantic forest phytogeographic domain, Eugenia flavicarpa can be distinguished mainly by the combination of smooth leaves with indumentum on both surfaces, with two marginal veins, usually ramiflorous inflorescences, pedicels 4.5–9.7 mm long, flower buds 3.5–4 mm in diameter, and by the calyx lobes that are 2–3 mm long with rounded to obtuse apices. Morphological analyses were performed to explore the significance of quantitative diagnostic features between the new species and the closely related species, Eugenia farneyi. Notes on the habitat, distribution, phenology, and conservation status of Eugenia flavicarpa are provided, as well as a key for all species of Eugenia subg. Pseudeugenia from forest vegetation of the Atlantic forest phytogeographic domain. [ABSTRACT FROM AUTHOR]

We describe a new species of Terminalia (Terminalia nildae), currently known only from southern Bahia State, an area of Brazilian Atlantic Forest characterized by high species richness and high levels of endemicity. A description, illustration, photographic plate, map of geographic distribution, as well as a table with morphological comparisons and key to the Terminalia species occurring in the Brazilian Atlantic Forest, including T. nildae, are provided herein. [ABSTRACT FROM AUTHOR]

Fritzschia atropurpurea, an endemic new species from the Serra do Cipó, Espinhaço Range, Minas Gerais state, Brazil, is described and illustrated. This new species can be easily differentiated from its congeners by the combination of the following characters: hirsute-glandular trichomes covering the branches, petioles, leaves, bracteoles, pedicels, hypanthium, sepals, and the medial-apical portion of the right margin of the petals; membranaceous leaves with a dark purple abaxial surface; and long pedicels. Images from scanning electron microscopy, photos of the species in the field, a distribution map, and a key to identify the congeners that occur in the Serra do Cipó are presented. We suggest that if a formal assessment were performed, Fritzschia atropurpurea would probably be categorized as an Endangered (EN) species. [ABSTRACT FROM AUTHOR]