Ariane Luna Peixoto

A distribuição geográfica da família Rubiaceae Juss. na Flora Brasiliensis de Martius

Flora Brasiliensis, planned and edited mainly by Karl Friederich Philipp von Martius, from 1840 and 1906, deals with all species from Brazilian Flora known at that time. In this work, the Rubiaceae, represented by 99 genus and 1043 species, was taxonomicaly analysed by K. Schumann and Mueller Argoviensis. The geographical distribution study, presented on pages 415 to 422 of volume 6, part 6, was written only by Schumann. Reading and interpretation of this work is very important and sometimes indispensable for Brazilan flora researchers, specially for those dedicated to taxonomy, floristic and fitogeography. The descriptive text on the geographical distribution in Latin and the various changes on generic and specific names raise difficulties for comprehending Schumann’s great vision about the whole Rubiaceae family in Brazilian flora and the presence of this family’s taxa throughout different Brazilian biomes. This paper presents the Portuguese translation of the latin text by Schumann on the geographical distribution of Rubiaceae, and updates scientific names presented there. Key-words: Rubiaceae, Flora Brasiliensis, Fitogeography, Brazilian Flora

Taxonomic significance of pollen morphology for species delimitation in Psidium (Myrtaceae)

Previous studies reported Psidium as one of the most difficult genera to delimit within the American Myrtaceae. Even though palynology has improved the taxonomy of Angiosperms, information about the usefulness of pollen morphology for taxonomic purposes in Myrtaceae remains contradictory. Here, we investigate the significance of pollen morphology for Psidium taxonomy with specific focus on its usefulness for determining species groups of taxonomic significance. Pollen traits observed by light and scanning electron microscopy were quantified and examined using cluster and ordination analyses. Average size of pollen grains was visualized by boxplots. Pollen grains of Psidium are isopolar, oblate, peroblate or oblate-spheroidal, 3-syncolporate or 4-syncolporate. The sexine ornamentation is rugulate, granulate or spinulose-granulate and differs between the mesocolpium and apocolpium. Cluster analysis revealed four distinct groups: Psidium cauliflorum (G1) and Psidium oligospermum (G3) as single-species groups; Psidium brownianum, P. oblongatum, P. ovale, P. sartorianum, P. guajava, Psidium sp. 1, Psidium sp. 2 (G2), and Psidium cattleianum, P. longipetiolatum, P. guineense, P. myrtoides (G4). Supported by ordination analysis, three traits better explained these groups: type of exine ornamentation, size of P-EV and pollen shape. The used approach efficiently distinguished related species, as well as explained species groups of taxonomic significance suggesting pollen morphology to be a significant source of information for taxonomic studies in Psidium.

The Genus Stylogyne (Myrsinoideae - Primulaceae) in Brazil

Abstract The Neotropical genus Stylogyne (Myrsinoideae - Primulaceae) is revised for Brazil. Eighteen species occur in this country exclusively in the Atlantic and Amazon forests. Stylogyne incognita, S. lasseri, S. serpentina, and S. spruceana are new records for Brazil. Stylogyne araujoana, S. martiana, S. sordida, S. carautae, S. depauperata, S. leptantha, and S. warmingii were considered threatened species. This paper provides diagnostic descriptions, keys for identification, and maps detailing the distribution of species in Brazil. New synonyms are proposed for S. atra, S. cauliflora, S. nigricans, and S. pauciflora.

Flora of Espírito Santo: Psidium (Myrtaceae)

This study presents a floristic-taxonomic treatment of Psidium in the state of Espírito Santo, and is a result of fieldwork combined with analyses of herbarium specimens. Fourteen species of the genus were recognized in Espírito Santo state (P. brownianum, P. cattleianum, P. cauliflorum, P. guajava, P. guineense, P. longipetiolatum, P. myrtoides, P. oblongatum, P. oligospermum, P. ovale, P. rhombeum, P. rufum P. sartorianum, and Psidium sp.), accounting for about 34% of the species richness estimated for the genus in the Atlantic Rainforest biome. The species occur predominantly in lowland forests up to 700 meters above sea level. These areas are highly threatened due to urbanization of coastal areas and agricultural expansion in the state Espírito Santo. Therefore, the conservation of Psidium species in this state requires the creation of more lowland protected areas.

A new species of Stylogyne (Myrsinaceae) from the Atlantic Forest of Brazil

Stylogyne araujoana, a new endemic species from the Atlantic Forest Region of Rio de Janeiro State, Brazil is described, illustrated, and mapped. Its relationships with Stylogyne pauciflora and Stylogyne sordida are discussed, and comments concerning the taxonomy, ecology, and conservation status are provided. Micromorphological leaf characters are illustrated and discussed.ResumoStylogyne araujoana, uma nova espécie endêmica da Floresta Atlântica do estado do Rio de Janeiro, Brasil, é descrita, ilustrada e mapeada. Sua relação com Stylogyne pauciflora e Stylogyne sordida é discutida, e são apresentados comentários acerca de sua taxonomia, ecologia e status de conservação. Caracteres micromorfológicos da folha são ilustrados e discutidos.

Revisitando a flora de Macaé de Cima, Rio de Janeiro, Brasil: o gênero Psidium (Myrtaceae)

Abstract Psidium species of Macae de Cima, Rio de Janeiro, Brazil were revisited after just over 20 years since the publication of the Myrtaceae study for this area of Atlantic forest, which currently constitutes an Environmental Protection Area. The species identification was based on analysis of herbarium collections, and observation of individuals in the field. The results include the taxonomic treatment, identification key, comments and photographic record of the species. The number of species of Psidium in the study area was expanded to three for six species, one of which P. ovale represents a new record for the state of Rio de Janeiro. The results showed the need for continued studies of flora, especially in high-diversity areas, and its importance for conservation of species and protected areas management. Key words : conservation, Brazilian flora, Atlantic Forest, species richness, taxonomy. Revisitando a flora de Macae de Cima, Rio de Janeiro, Brasil: o genero Psidium (Myrtaceae)

Four new species of Ixora (Rubiaceae, Ixoreae) from Brazil

Four new species of Ixora (Rubiaceae, Ixoreae) from Brazil are described and illustrated and their relationships to morphologically similar species as well as their conservation status are discussed. The new species, Ixora cabraliensis, Ixora emygdioi, Ixora grazielae, and Ixora pilosostyla are endemic to the Atlantic Forest of southern Bahia and Espirito Santo.ResumoSão descritas e ilustradas quatro novas espécies de Ixora (Rubiaceae, Ixoreae) para o Brasil bem como discutidos o relacionamento morfológico com espécies mais similares e o estado de conservação. As novas espécies Ixora cabraliensis, Ixora emygdioi, Ixora grazielae e Ixora pilosostyla são endêmicas da Floresta Atlântica, no trecho do sul do estado da Bahia e o estado do Espírito Santo.