Biogeografia de Cratylia e areas prioritarias para coleta. [Biogeografia de Cratylia y areas prioritarias para su recoleccion].
1996
Queiroz Luciano Paganucci de | Coradin Lidio
Cratylia is a legume genus comprised of five shrub species. it is found exclusively in South America, to the east of the Andes and to the south of the Amazon River. The distribution of Cratylia species is, in general, restricted to a given type of vegetation. Thus, C. mollis is found in Caatinga, C. hypargyrea in the perimeters of the Atlantic Zona da Mata region, C. bahienesis in the seasonal forests of southeast Bahia, and C. intermediate to the west of Parana and to the northeast of the Misiones province. Cratylia argentea, unlike the other species, is found in a broad range of habitats, such as the Cerrados, Mata Ciliar, in the margins of the Caatinga-Cerrados transition, and in the seasonal forests. It is extensively distributed, from western Peru to the state of Ceara in Brazil. Data on distribution and limited morphological differentiation indicates that the Cratylia genus may have originated recently, and that its history appears to be associated with the repeated process of expansion and retraction of the native savanna vegetation during the Quaternary. At least two species, C. argentea and C. mollis, have an acknowledged forage potential. Cratylia mollis, however, does not seem to have morphological differentiation at the ecotype level, since the same forms are found from the central-east part of the state of Piaui to the center-north of Bahia in Brazil. Cratylia argentea, on the contrary, presents-in addition to its typical form in the Cerrados of central Brazil-other distinct ecotypes that are common in the iron-rich soils of the Caatinga-Cerrados area and in the seasonal forests located on the eastern slopes of the Andes. Accordingly, it is important that these variations are evidenced in the germplasm collection.
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