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6Universidade Federal do Amazonas (UFAM), 69077-000 -Manaus, AM, Brasil.*Autor para correspondência RESUMO -Phenakospermum guyannense é popularmente conhecida na Amazônia como sororoca, geralmente encontrada próxima a cursos d´água, em ambientes ombrófilos. Objetivou-se com este estudo descrever a morfoanatomia e histoquímica da semente madura de P. guyannense, como contribuição a estudos taxonômicos, fisiológicos e ecológicos. Sementes maduras foram coletadas nas margens da Cachoeira do Urubuí, no Município de Presidente Figueiredo, Amazonas. O estudo anatômico foi realizado conforme técnicas usuais para análise em microscopia óptica e eletrônica de varredura. Foram aplicados testes histoquímicos para a detecção de compostos fenólicos, amido, proteína e lipídios. A semente madura de P. guyannense é estenospérmica, com envoltório de cor negra, formado por vários estratos de diferentes tipos celulares, sendo a maioria impregnada de compostos fenólicos. O hilo é punctiforme, circundado por células que constituem o arilo. O endosperma é sólido, constituído por células tetraédricas de conteúdo amiláceo e proteico. O embrião é basal capitado, apresentando células de conteúdo lipídico e proteico, composto por eixo hipocótilo-radícula levemente dilatado de forma cilíndrica e localiza-se na região proximal. O haustório apresenta formato aplanado e situa-se na região distal.Termos para indexação: anatomia vegetal, sementes florestais, Zingiberales.Morpho-anatomy and histochemistry of the seed of sororoca (Phenakospermum Guyannense Rich.) Endl. -Strelitziaceae)ABSTRACT -Phenakospermum guyannense, popularly known in the Amazon as sororoca, is usually found along rivers and in ombrophilous environments. The objective of this study was to describe the morpho-anatomy and histochemistry of mature seeds of P. guyannense collected at the Urubuí Waterfall, Presidente Figueiredo, Amazonas state, Brazil. Seed anatomy was studied using a light and a scanning electron microscopes (SEM). Histochemical tests were performed to identify phenolic compounds, starch, protein and lipids. The mature seed of P. guyannense is stenospermic, with a black seed coat composed of several layers of different cell types, with most containing phenolic compounds. The hilum is punctiform, surrounded by cells, which form the aryl. The endosperm is solid, formed by tetrahedral cells containing starch and protein. The embryo, which is cylindrical and located in the proximal region, is basal capitate, with cells containing lipids and proteins and is composed of a slightly dilated hypocotyl-radicle axis. The haustorium is flattened and located in the distal region.

ResumoPassiflora fissurosa M.A.D.Souza sp. nov., até o momento conhecida apenas da Reserva Florestal Adolpho Ducke, no Amazonas, Brasil, é descrita e ilustrada. Foi inserida no Subgênero Passiflora, Superseção Passiflora, Seção Laurifoliae e Série Laurifoliae, por apresentar folhas simples e inteiras, pecíolo biglandular, brácteas foliáceas, livres, maiores que 1 cm, pertencendo ao grupo de espécies com as duas séries externas da corona subiguais. Morfologicamente é semelhante a P. nitida, que difere pelo opérculo horizontal-encurvado com margem ereto-divergente, anel nectarífero presente, límen vertical e ovário glabro. A designação do epíteto deve-se à característica do ritidoma, suberoso e profundamente fissurado, característica somente encontrada em P. phellos, também pertencente à Série Laurifoliae, mas do grupo de espécies com a primeira série da corona menor que a segunda. , presently known only from the Adolpho Ducke Forest Reserve in Amazonian Brazil, is described and illustrated. P. fissurosa belongs in the subgenus Passiflora, Supersection Passiflora, Section Laurifoliae and Series Laurifoliae, with simple, entire leaves, a biglandular petiole, free foliaceous stipules larger than 1 cm, in the group of species with the outer two series of the corona sub-equal. Morphologically it resembles P. nitida, which differs by the horizontal curved with erect-divergent margin operculum, the presence of a nectariferous ring, vertical limen and glabrous ovary. The epithet is derived from the characteristic of the bark, which is corky and profoundly fissured, which is showed only by P. phellos of the Laurifoliae group which has the first series of the corona smaller than the second.

There are described and illustrated Myrcia caloneura, M. oreophila, M. sticta and M. tarauacana. Myrcia caloneura, from the states of Amazonas and Pará, is related to M. rugosior, but differs by its adult glabrescent blades and tetramerous flowers; M. oreophila, from the state of Roraima,is related to M. aegiphiloides, but has pilose, loosely reticulate blades and pilose flowers; M. sticta, from the state of Amazonas, is close to M. splendens, but has blades with rounded to cordate base and larger and easily visible glandular dots, and M. tarauacana is related to M. aequatoriensis and M. crassimarginata but has shorter blades and longer inflorescences. Conservation status of each species is also suggested.

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Calyptranthes irregularis, Eugenia abunan and Myrcia macaca are described, illustrated and compared with related species. Calyptranthes irregularis, from the state of Amazonas, is related to C. cuspidata, from which it is distinguished by blades with adaxially sulcate midvein, larger flowers and a calyx with irregular splitting; Eugenia abunan, from the state of Rondônia, is related to E. multirimosa, differing in its larger flowers and absent calyx tube; Myrcia macaca, from the state of Roraima, is related to M. porphyrea and M. crispa, differing mainly by its trilocular ovary.

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There are described, illustrated and compared with related species Eugenia lisboae and Eugenia ramosii. Eugenia lisboae is similar to E. citrifolia, differing by its adaxially concave midvein, triangular and basally connate sepals and ellipsoid fruits. Eugenia ramosii is morphologically similar to E. diplocampta, from which it differs by campto-brochidodromous venation, deltoid or scaly with acute apex and oblong-orbicular sepals that conceal the floral globe but not closing the top of bud, which is globose.