Antônio Elielson Sousa da Rocha

Aspectos fitossociológicos, florísticos e etnobotânicos das palmeiras (Arecaceae) de floresta secundária no município de Bragança, PA, Brasil

The purpose of this study was to conduct a floristic inventory of the palms in six fragments of secondary forest in the Municipality of Braganca, Para State, Brazil. In this study 14 species (nine genera) were identified. Maximiliana maripa (Aubl.) Drude and Astrocaryum gynacanthum Mart. were the dominant species. We present ethnobotanical data, identification keys, descriptions, illustrations, specimens examined, common names, and general comments about the species.

Inventário da família Orchidaceae na Amazônia Brasileira: parte I

A total of 378 species of 99 genera were registered, some of these species are new to science while and others are new records for the Brazilian flora.

Checklist das Poaceae de áreas inundáveis e inundadas do nordeste do estado do Pará

A list of Poaceae collected in periodically flooded and permanently flooded areas in the paraense northeastern region of Para State is presented. Currently, 31 genera and 83 species are recognized. The most representative groups are Paspalum, Panicum (17 and 18 taxa, respectively), and the tribe Paniceae (57 taxa). The systematic position, taxonomic affinities, geographical distribution, vegetative cicle, a list of examined specimens, and illustrations of spikelet of each species are given.

Volatiles from aerial parts and rhizomes of Kyllinga brevifolia Rottb. growing in Amazon.

Abstract Essential oils of rhizomes and aerial parts of Kyllinga brevifolia collected in two municipalities of the State of Pará (Santarém Novo and Salinópolis) in Brazil were obtained by hydrodistillation and analyzed by GC-FID and GC/MS. The oils reveal a high content of the diterpenoids belonging to the labdane group, mostly manoyl oxide (6.8%-31.1%), 13-epi-manoyl oxide (5.7%-26.1%), 11α-hydroxymanoyl oxide (5.9%-16.2%) and 1β-hydroxymanoyl oxide (4.6%-22.1%). Hexane extract obtained of the rhizomes collected in Santarém Novo was rich in manoyl oxide (30.4%), 11α-hydroxymanoyl oxide (26.7%) and 1β-hydroxymanoyl oxide (14.7%).

Variation in Volatiles of Ocimum campechianum Mill. and Ocimum gratissimum L. Cultivated in the North of Brazil

Abstract The essential oils of seven samples of Ocimum campechianum and five samples of O. gratissimum cultivated in the state of Pará were obtained by hydrodistillation and analyzed by GC and GC-MS. The most abundant components identified in the leaf oils from O. campechianum were: eugenol (32.2% - 60.6%), methyleugenol (60.6% - 69.5%), 1,8-cineole (0.9% - 19.7%), and elemicin (0.2% - 65.9%). The most abundant components identified in the oils from O. gratissimum were: Thymol (13.1% - 36.2%), γ-terpinene (0.2% - 28.1%), 1,8-cineole (0.0 – 25.2%), and p-cymene (4.4% -19.9%). The results reveals the occurrence al least four types of O. campechianum in the State of Pará, and at least two types of O. gratissimum. The O. gratissimum studied here belongs to variety macrophyllum.

Contribuição à taxonomia de Axonopus P. Beauv. (Poaceae) no Estado do Pará, Brasil

Twenty two species of the genus Axonopus P. Beauv. are cited to Para State. An identifiaction key is provided, as well as a brief description, geographical distribution and illustration for each species. Four additional species previously mentioned to Para State are left aside, waiting for further studies.

Floristic composition and identification keys for Poaceae from the Amazonian coastal savannas, Brazil

As savanas da regiao costeira da bacia amazonica estao situadas no complexo contato entre a floresta e a costa atlântica. Nestas formacoes as Poaceae se destacam como um dos grupos vegetais mais importantes. O presente trabalho objetivou o levantamento da Familia Poaceae nas savanas costeiras amazonicas, a elaboracao de uma lista de especies acrescida de ilustracoes e chave para a identificacao dos taxons confirmados. Foram registradas quatro subfamilias, 58 especies, distribuidas em 29 generos, sendo Axonopus e Paspalum os mais ricos. As amostras encontram-se depositadas nos herbarios do Museu Paraense Emilio Goeldi (MG) e do Instituto de Pesquisas Cientificas e Tecnologicas do Estado do Amapa (HAMAB). As savanas costeiras amazonicas apresentam especies de Poaceae de ampla distribuicao, baixo endemismo e reduzido numero de especies exoticas, com influencia floristica das savanas das Guianas e do Bioma Cerrado.

Mimosoideae (Leguminosae) do litoral paraense

This study deals with the taxonomic treatment of Mimosoideae on the coastal sandbanks of Para, since they are poorly known under this aspect. That study includes the analysis of botanical material from new collections and specimens of the MG and IAN herbariums, besides that found in specialized literature. Are given identification key, descriptions, and illustrations of the taxa, as well as data concerning geographical distribution, additional comments, flowering and fructification period, and habitat of the species. The fruit has the quality of great prominence in the separation of taxa. The results pointed out the presence of seven species, three varieties and one subspecies, distributed in six genera. Inga thibaudiana subsp. thibaudiana e Mimosa candollei are new records for the sand coast of Para. The genus Inga Mill. was the most representative with five species. Entada polystachya var. polystachya and specially Chloroleucon acacioides presented the widest distribution, and sandbank forest formation was the ecosystem which had the largest number of species.

Uma sinopse de Lacunaria Ducke

Lacunaria Ducke is a tropical genus with eight species, most of these distributed in Brazilian Amazon. Since the treatment by Ducke, in the third decade of 20th century, these species have not been revised taxonomically. A synopsis of the genus, including an identification key, short descriptions, synonymy, taxonomic comments and geographical species distribution is presented.

Variações morfológicas do Labelo de Catasetum barbatum (Lindl.) Lindl. (Orchidaceae)

This paper presents a study of morphological variation, of the lip of the flowes of Catasetum barbatum (Lindl.) Lindl., basead on plants collected in Brazillian Amazonia and Central Brazil. Sixteen variations in 4 different habitats were recognized and related to the ecological characteristics of the environment. Geographical distribution and the illustrations of the lip are presented.