Fenologia e descrição de estruturas reprodutivas de três espécies florestais da várzea do Estuário Amazônico: Matisia Paraensis huber, Pseudobombax munguba (Mart, & Zucc) Dungand e Pterocarpus amazonicus huber

Abstract

Information on the phenology and description of reproductive structures of Matisia paraensis Huber, Pseudobombax munguba (Mart. & Zucc.) Dugand and Pterocarpus amazonicus Huber, tree species occurring in the Amazonian estuarine floodplain, are presented. The study was carried out in the island of Combú, municipality of Belém, Pará from Aug/2002 to Jun/2003. The flowering and fruiting phenophases were observed weekly in 10 individuals of each species, except for Matisia paraensis Huber (06 individuals). The collected floral material was fixed in 70% alcohol and the ripe fruits were put in plastic bags and later taken to the ecology laboratory of the Botany Department of the Emílio Goeldi Museum of Pará to describe the morphological characters using a magnifying glass. Matisia paraensis flowered from November to December and February to April and bore fruit from October to January and March to April; the flower is solitary hermaphrodite, diperianthus, heteroclamídea, polystemone; calyx greenish, gamosepalous, pentamerous, radial; corolla white, dialipetal, pentamerous, radial; the fruit is berry-like. Pseudobombax munguba flowered from March to April and so far there has been no fruit formation; the flower is solitary, hermaphrodite, conspicuous, diperianth, heteroclamídeous, polystemone; calyx greenish, gamosepalous forming a single structure of radial symmetry; corolla white, dialipetal, pentamerous, deciduous, radial, classified as anomalous. Pterocarpus amazonicus flowered in February and fruited from February to April; with terminal intlorescences, compound pluritlora, cluster-like monopodial; diperiantate, heteroclamídeous flowers; yellow calyx; greenish corolla, gamoseptal, pentamerous, radial; the fruit is dry. It was concluded that Matisia paraensis and Pterocarpus amazonicus showed asynchronous phenophases and Pseudobombax munguba even not having closed its reproductive cycle showed a tendency for synchronism; the morphological descriptions showed no variations when compared to the literature.