Estudo de leguminosae herbáceas ocorrentes em campos arenosos alagados do leste paraense.

Abstract

The herbaceous Leguminosae found in coastal ecosystems are little known and are at risk of disappearing without having their identifications and occurrence known, because of the intense occupation and consequent destruction of these natural fields, generally located on podzolic soils along the PA-140 highway axis (Vigia, including Sta. Rosa and São Caetano de Odivelas - Salgado Zone) and the Arapari-Moju-Igarapé Miri axis (Tocantina Zone). This work aims to survey, systematically review and register its occurrence. According to bibliographical, field and herbarium indications, the genera Stylosanthes Sw., Zornia Gmel. and Desmodium Desv. The survey in the MG and IAN herbaria confirmed the occurrence of the following species: Stylosanthes angustifolia Vog., S. gracilis H. B. K , S. grandifolia M. B. Ferr. et Souza Costa, Zornia latifolia Sm., Z. curvata Moh1., Desmodium barbatum (L.) Bth. and D. canum (Gmel.) Schinz. et Thellung. In the first two excursions, it was observed that many of the fields recorded through collection books and herbarium samples no longer exist and some of the others are being occupied by crops and cattle or being destroyed by sand removal. On the first trip to the fields of the Salgado Zone, they were dry and burned and only one specimen of Zornia latifolia Sm. was found. On the second trip to the fields of the Tocantina Zone, many specimens of Desmodium barbatum (L.) Bth. After surveying these seven species, in addition to the specialized bibliographical survey, a systematic study, description and drawings of the habits and floral parts of species belonging to the genus Stylosanthes were started, continuing with Zornia and Desmodium. The next step provides for anatomical studies of the most representative species of the genera studied.