Resumo No presente trabalho, os autores apresentam o estudo dos caracteres anatômicos das madeiras de 4 espécies do gênero Zanthoxylum (Rutaceae) e, para cada uma delas, são apresentadas informações sobre: a) a árvore: descrição botânica, dispersão geográfica, habitat, fenologia e nomes vulgares; b) a madeira: caractersticas gerais, descrição microscópica, usos comuns, 8 microfotografias do lenho das espécies estudadas, 4 pranchas esquemáticas contendo as diversas formas dos elementos vasculares e um quadro apresentando as principais características e diferenças anatômicas das espécies. As espécies estudadas foram: Zanthoxylum compactum (Huber ex Albuquerque) Albuquerque. Z. dellomei (de Albuquerque) Waterman, Z. machadoi (de Albuquerque) Albuquerque e Z. rhoifolium Lamarck.

Summary This paper deals with a study on the dendrology and microscopic anatomical features of 4 species of the genus Zanthoxylum (Rutaceae): Z. compactum, Z. dellomei, Z. machadoi e Z. rhoifolium. For each species the following data are given: 1) Tree: its description, geographic distribution, habitat, phenology and vernacular names. 2) Wood: general characteristics, microscopic description, and common uses. Eight microphotograps of wood tissue, four schematic plates with several forms of vascular elements, and a table with the main features and the anatomical distinctions of the studied species are presented.

Summary New cobinations for the genus Angostura Roemer & Schultes (Rutaceae) are proposed.

Resumo Apresenta este trabalho 13 espécies aquáticas nativas, com possibilidade do seu uso extensivo como forragem na Amazônia brasileira. Cada espécie é descrita de maneira simples e sucinta para uma melhor compreensão. São apresentadas 13 figuras ilustrativas.

Summary This paper deals with 13 native floating aquatic plants and their possibilities for extensive use as forage in the Brazilian Amazon. The species are presented in alphabetical order according to the common names most in use. A simple and succint description is provided for each species, along with additional data. Thirteen illustrative figures are presented.

Resumo Spiranthera guianensis, descrita originalmente por Sandwith (1928 & 1940), tem agora sua diagnose ampliada com uma descrição mais detalhada de seus frutos. É apresentada uma figura ilustrativa. Pela primeira vez coletada no Brasil.

Summary Spiranthera guianensis, originally described by Sandwith (1928 & 1940), has now its diagnosis enlarged with a more detailed description of its fruits. An illustrative figure is presented. First collection for Brazil.

Resumo O estudo da nervação foliar de duas espécies de Bignoniaceae revelou a ocorrência de mesmo padrão de nervuras secundárias: camptódromo. subtipo eucamptódromo combinado com o subtipo broquidódromo; variações na rede de nervuras podem auxiliar na discriminação de taxa. Acompanham 2 figuras.

Summary This paper is the continuation of a catalogue of leaf venation of plants of the Amazonian flora. 2 species of Bignoniaceae are studied. Results indicate the occurence of Hickey's vein pattern camptodromus, subtype eucamptodromus combined with the subtype brochidodromus. For taxonomy of the Bignoniaceae, variations in the vein network allow the separation of taxa. Results are documented by descriptions and by drawings.

RESUMO Revisão taxonômica das Rutaceae do Estado do Amazonas que conta com 16 gêneros e 29 espécies (inclusive 2 variedades), cujas características morfológicas externas são suficientemente distintas para permitir a separação intergenérica e interespecífica dos taxa estudados. Os gêneros que ocorrem na região são Adiscanthus, Cusparia, Decagonocorpus, Erythrochiton, Esenbeckia, Galipea, Hortia, Leptothyrsa, Mannieria, Myllanthus, Nycticalanthus, Raputia, Ravenia, Spathelia, Ticorea e Zanthoxylum. Como auxílio à classificação dos gêneros e dos espécies das Rutaceas do Estado do Amazonas são apresentadas oito chaves analíticas baseadas nos caracteres morfológicos das plantas estudadas. Ilustram o trabalho 40 fotografias das 29 espécies dos 16 gêneros e 16 figuras mostrando a distribuição geográfica dos taxa estudados.

SUMMARY Our curiosity about the Rutaceae arose due to its confused taxonomy, the number of taxa increased without order with several papers, descriptions of new genera and species in dispersed literature without a monograph of the family since Engler (1896 and 1931). In the State of Amazonas, Brazil, there are 16 genera belonging to the Rutaceae with 29 species (including 2 varieties), whose externai characteristic features are sufficiently distinct to allow the intergeneric and interespecific separation of the studied taxa. The genera that occur in our region are Adiscanthus, Cusparia, Decagonocarpus, Erythrochiton, Esenbeckia, Galipea, Hortia, Leptothyrsa, Monnieria, Myllanthus, Nycticalanthus, Raputia, Ravenia, Spathelia, Ticorea e Zanthoxylum. Ecologically, the family Rutaceae occurs in many kinds of habitats. For example, the species Adiscanthus fusciflorus is found in highland campina and campina forest, and in highland primary and secondary forests. This shows, the adaptability of the species in different ecological habitats. Within the family internal glands are developed which secrete a strongly aromatic oil whose ecological role, according to Haberlandt (1928), probably provides additional protection to the plants against the attack of predators. The woods of the Rutaceae are utilized for several economical purposes and special reference should be given to the species Euxylophora paraensis Huber ("pau amarelo") whose wood is used in the timber industry mainly for parquets, according to Loureiro & Silva (1968). Another species of economical value for the pulp and paper industry is Zanthoxylum rhoifolium Lamarck ("tamanqueira da terra firme") whose wood produces a cellulose yield about 45,1%, as stated by LeCointe (1947). Keys for identification of the genera and species are presented. 40 photographs of the 29 species of the 16 studied genera and 16 figures illustrate this work.

Sinopse Informações gerais e anátomo-foliares sobre 2 Couma são apresentados neste trabalho, acompanhadas de 4 figuras.

Summary The author studies some morphological aspects on two species, of Couma (Apocynaceae) dealing with their taxonomy, and geographic distribution and general botanical data are also considered. Results indicate that foliar morphology may be used for specific identification. Results are documented by descriptions and by drawings.

Sinopse Os autores acrescentam no presente trabalho a diagnose e a descrição microscópica da madeira da espécie nova Fagara Machadoi Albuq., completando-se a nota prévia anteriormente publicada (Albuquerque & Honda, 1971).

Summary In this paper the diagnosis and wood microscopic description of the new species Fagara Machadoi Albuq. are added by the authors, completing a previous note published before. Results are documented by botanical description of the species, by general characteristics and macroscopic and microscopic descriptions of its wood, and by figures.

Sinopse Exames da nervação foliar de 5 espécies de Abuta revelaram a ocorrência dos padrões acródromo, camptódromo e broquidóbromo (combinado com o camptódromo), e de variações na rede de nervuras suscetíveis de auxiliar à identificação específica.

Summary The present paper is the continuation of a catalogue of venation of plants of the Amazonian flora 5 speceis of Menispermaceae belonging to the genus Abuta are studied. Results indicate the occurrence of Ettingshausen's vein patterns acrodomus, camptodromus and brochidodromus (combined with camptodromus), which together with some variations in the vein network allow the identification of each species. 2 species show a noteworthy dense vein network in their leaves. Results are documented by descriptions and by drawings.

Sinopse No presente trabalho são fornecidos dados gerais, histoquímicos e morfológicos foliares de Aspidosperma carapanauba, A. marcgravianum e A. oblongum. Exames da morfologia foliar mostraram: padrão de nervação secundária broquidódromo; sistema fibrovascular dos pecíolos mantém-se de uma maneira constante, com os floemas externo e interno limitando o xilema; do ponto de vista taxonômico, a morfologia da lâmina foliar, da nervura mediana e dos estomas evidenciou caracteres que podem auxiliar a discriminação especifica; laticíferos do tipo não articulado; esclerócitos simples e ramificados. Resultados estão documentados por desenhos e nos quadros I e II.

Summary This paper is a contribution to the knowledge of the Aspidosperma of Brazilian Amazonia. Morphology of petiole and leaf-blade are studied. Flowers, fruits and geographical distribution are also considered. Foliar morphology may be used for specific identification. Tables I and II present characters common and peculiar to each species. Results are documented by drawings.

Summary The present paper is the continuation of a catalogue of foliar venation of plants of the Amazonian flora, dealing with a source of data for ecology and paleobotany, and a set of auxiliary characters in taxonomy. Results indicate that certain differences in the arrangement of vein network, in the number of translucid glands per mm2, and in the gland position along leaflet margin allow the studied species to exclude from other four species belonging to the camptodroma group. A key for comparing specific discrimination among the species of genus Fagara belonging to the camptodroma group of Ettingshausen's vein patterns is presented.