Alessandro Silva do Rosário

Sinopse das espécies de Marlierea Cambess. (Myrtaceae) na Amazônia brasileira

A morphological study of Marlierea Cambess. occurring in Amazonian Brazil was carried out in order to obtain a better understanding of the morphology and taxonomy of all species in the region and to provide data to elucidate the taxonomic segregation of Marlierea from the morphologically similar Myrcia DC. ex Guill. In Amazonian Brazil, Marlierea is represented by 11, primarily forest, species (Marlierea bipennis (O. Berg) McVaugh, M. caudata McVaugh, M. ensiformis McVaugh, M. ferruginea (Poir.) McVaugh, M. mcvaughii B. Holst, M. scytophylla Diels, M. spruceana O. Berg, M. subulata McVaugh, M. summa McVaugh, M. umbraticola (Kunth) O. Berg, and M. velutina McVaugh). The taxonomically problematic M. obumbrans (O. Berg) Nied. is discussed as a badly known species. The species are trees or shrubs with opposite leaves (sometimes alternate in M. velutina); inflorescences racemose or paniculate (in panicles, cymes, or dichasiums), sometimes in fasicles; flower buds generally closed; calyx lobes 4-5, opening irregularly; and petals frequently absent. The states of Amazonas and Para are the most species-rich. Marlierea spruceana and M. umbraticola are the most common species. Additional studies of M. obumbrans, morphologically intermediate between Marlierea and Myrcia, will be untaken in the future in order to establish the correct taxonomic placement of this enigmatic species.

A New Species of Phyllanthus (Phyllanthaceae) Endemic to Amazonas State, Brazil

Abstract.  A new species of Phyllanthus L., P. aracaensis G. L. Webster ex Secco & A. Rosário (Phyllanthaceae), probably endemic to Amazonas State, is described and illustrated. In terms of its habit and overall appearance it is superficially close to P. myrsinites Kunth, a species with variable leaf morphology, which is widely distributed throughout the Amazon region. The new species may be distinguished from P. myrsinites by its orbicular leaves without a subapical gland on the abaxial face, staminate flowers isolated or in pairs with sepals free, stamens with partially joined filaments at base, and style with branches joined, apically free, trifid.

Contribuição à taxonomia de Marlierea (Myrciinae; Myrtaceae) no Brasil

Resumo Apresenta-se uma circunscricao taxonomica de Marlierea e tres novos registros de ocorrencia para o genero na Amazonia brasileira, sendo dois para o Brasil, tres para o estado do Para e um para o estado do Amazonas. Comentarios sobre caracteristicas diagnosticas e afinidades taxonomicas de cada especie, bem como os respectivos dados de distribuicao geografica e ambientes tipicos de ocorrencia sao tambem fornecidos. Recomendacoes para atualizacao da lista de especies de Myrtaceae da flora do Brasil tambem sao apresentadas. Contribution to the taxonomy of Marlierea (Myrciinae; Myrtaceae) in Brazil Abstract This paper presents a taxonomic circumscription of Marlierea and three new records of occurrence for the genus in the Brazilian Amazon, two in Brazil, three for the State of Para and one for the State of Amazonas. Comments on the morphology and affinity of taxa are provided to facilitate recognition of each species, as well as their geographical distribution data and typical environments occurrence of these species in the Amazon region. Recommendations for updating the list of Brazilian Myrtaceae species are presented.

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

This study presents a floristic treatment for the species of Myrtaceae occurring in the canga of the Serra dos Carajás, Pará, Brazil. Based on collections deposited in herbaria and field samples, 26 species were confirmed, distributed in five genera: Calyptranthes (1 sp.), Campomanesia (1 sp.), Eugenia (8 spp.), Myrcia (15 sp.) and Myrciaria (1 sp.). One new record for the state of Pará was found. Identification keys for genera and species, morphological descriptions, and taxonomic comments are provided.

Taxonomic studies of Myrcia (Myrciinae, Myrtaceae) in Brazil: morphological novelties, circumscriptions, and new records for the Amazon

Based on recent studies on Myrtaceae in the Brazilian Amazon, we present an update of the morphological circumscription of Myrcia, including eight new occurrences of the genus in Para State, three of which represent new records for the Amazon region. Comments are provided on the diagnostic features and taxonomic affi nities of each species, their geographic distributions, and their preferred environments of occurrence. Recommendations for updating the list of Brazilian Myrtaceae species are presented.

Notas sobre Ugni Turcz. (Myrtaceae) na Amazônia Brasileira

The goal of this study is to document the occurrence of the genus Ugni Turcz. in Brazil, where it is rare and poorly known. Ugni comprises four species, but only U. myricoides (Kunth) O. Berg occurs in Brazil, in high-elevation areas on Roraima Mountain (State of Roraima) and in the Serra of Neblina (State of Amazonas). This species is only known in the Amazonian herbaria by just one collection. Ugni is easily confused with Myrtus L. due the morphological resemblance between them, but Ugni are shrubs or small trees. Its leaves are small, usually less than 2 cm long, and coriaceous, and have revolute margins and inconspicuous secondary veins; its flowers are solitary and usually have five, sometimes four, white petals with a reddish central spot and usually three, sometimes two, locules per ovary, each with four to 23 ovules; and its fruits have 15 to 20 seeds with C-shaped embryos.