Flórula fanerogâmica das restingas do Estado do Pará, Apa de Algodoal / Maiandeua, Maracanã-PA. Rubiaceae Juss

Abstract

The results of a taxonomic study about the Rubiaceae of the APA of Algodoal/Maiandeua are presented (Northeast of the State of Pará). One of the most representative families in sandcoast and important for the understanding of this and other ecosystems. This taxon is represented in the study region, until at the moment, for about 17 species, distributed in 15 genus. The methodology employed consisted of the rehydration and dissect of the herborized material, deposited in MG and IAN Herbarium, proceeding firom the APA of Algodoal, resulting of more than 10 years of floristic research in the study place. For the verification of some new register in ecosystem, collections in October of 2006 and February of 2007 had been carried. After that, the samples had been measured, described and drawn in clear chamber. A taxonomic key was elaborated, to facilitate the identification of the species. In this study, commentaries on the species had been added. In sandcoast of the APA of Algodoal/Maiaundeua, with relation to the species richness, taxa as the subfamilies Cinchonoideae and Rubioideae had not presented significant differences, being nine in first and eight in second. The supertribe Ixoridinae was best represented with six species, three in each others. The tribes with more species had been Gardenieae, with four species and Spermacoceae, three. The genus Guettarda and Psychotria had been with two species each one, in the another genus with one each. In the initial survey, carried through at MG and IAN herbarium, 23 species in 15 genus consisted. Six of them were incorrectly identified. Three had been sinonimized, Alihertia myrciifolia K. Sch., Psychotria harhiflora DC. and Tocoyena spmcei Standl.. Four have medicinal importance, Alihertia ediilis (Rich.) A. Rich. ex DC., Borreria verlieiHaia (L.) G. Mey., Guettarda angélica Mart. ex Müll. Arg. and Posoqueria latifolia (Rudge) Roem. & Schult.. Psychotria hoffmannseggiana (Willd. ex Roem. & Schult.) M. Arg. is related to the poisoning of the cattle and Tocoyena brasiliensis Mart. can be used as fungicidal in agriculture. The species of Rubiaceae are more concentrate in the formation of Myrtaceae's Forest, diminishing, in number of species, in direction to the beach. The species Guettarda spruceana M. Arg., Oldenlandia íenuis K. Schum., Posoqueria latifolia (Rudge) Roem. & Schult. and Retiniphyllum schomhurgkii (Benth.) M. Arg. they are new registers for the APA of Algodoal/Maiandeua. Established in bibliographic research, about the 17 species cited here, seven still occur in Brazilian others sandcoast, being of Rio de Janeiro that one that in common presents the biggest number of species with the APA of Algodoal/Maiandeua.