Nectandra Rol. ex Rottb. (Lauraceae) no Mato Grosso do Sul, Brasil

O trabalho apresenta o estudo taxonômico das espécies do gênero Nectandra no Mato Grosso do Sul, Brasil. Baseados na análise morfológica dos espécimes coletados em diferentes regiões do Estado são confirmados oito espécies de Nectandra: N. amazonum Nees, N. cissiflora Nees, N. cuspidata Nees, N. falcifolia (Nees) J.A. Castigl. ex Mart. Crov. & Piccinini, N. gardneri Meisn., N. hihua (Ruiz & Pav.) Rohwer, N. megapotamica (Spreng.) Mez e N. psammophila Nees. É fornecida uma chave de identificação para as espécies e apresentados descrições morfológicas, dados de distribuição geográfica, habitat, aspectos fenológicos, comentários taxonômicos e ilustrações para cada espécie.<br>This paper presents the taxonomic study of the species of Nectandra from Mato Grosso do Sul. Eight species of Nectandra were identified through the morphological analyses of specimens collected in different regions from the State: N. amazonum Nees, N. cissiflora Nees, N. cuspidata Nees, N. falcifolia (Nees) J.A. Castigl. ex Mart. Crov. & Piccinini, N. gardneri Meisn., N. hihua (Ruiz & Pav.) Rohwer, N. megapotamica (Spreng.) Mez and N. psammophila Nees. Identification key, morphological descriptions, geographic distribution, habitat, fenologic aspect, taxonomic comments, and illustrations are presented

Angiosperm association from the Río Turbio Formation (Eocene–?Oligocene) Santa Cruz, Argentina: revision of Hünicken’s (1955) fossil leaves collection

The Río Turbio Formation (Eocene–?Oligocene) is of particular paleobotanical interest owing to its combination of high fossil plant diversity associated with the coexistence of warm-temperate and cool-temperate components. As the first suite of fossils related to a documented stratigraphic section, Hünicken’s fossil plant collection is one of the most important from the Paleogene of South America. A total of 34 angiosperm species from the collection were reviewed and taxonomically updated, with Nothofagus as the dominant genus. The taxa identified indicate a warm and humid climate with the development of some elements of a cool-temperate climate marked by a transitional climate change to cooler conditions. The comparison of angiosperms from different paleofloras from the southernmost of South America confirms that the assemblage of Río Turbio Formation was similar to that of the Río Pichileufú area, both from Patagonia, Argentina.Fil: Vento, Barbara. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Pramparo, Mercedes Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentin