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Backgrounds and aims: The genus Anadenanthera is represented in Argentina by a single species, A. colubrina, with two varieties var. cebil and var. colubrina. These varieties can be clearly distinguished by the venation pattern of the leaflets. In this work a third variety, var. glabra, is here circumscribed by a combination of characters of its leaves and bark. M&M: Specimens at CTES and MCNS were studied, and field observations were performed in Argentinean natural environments. The specimens were analyzed morphologically with optical and scanning electron microscopies. Results: The new variety glabra differs from varieties cebil and colubrina by its stems without mamelons, leaves with rachis glabrous on both surfaces or only on the abaxial surface, and leaflets with a reticulated, closed and complex venation. An illustration, photographs, a morphological comparative table, a key to the varieties, and a distribution map are provided. Conclusions: The three varieties of Anadenanthera colubrina, var. cebil, var. colubrina and var. glabra, inhabit the Seasonally Dry Neotropical Forests of northern Argentina, showing the new variety a restricted distribution to the northeastern region of the country. [ABSTRACT FROM AUTHOR]

Adiantum peruvianum (Pteridaceae) and Serpocaulon polystichum (Polypodiaceae) are recorded for the first time for Argentina in this paper. These new records were collected during trips to La Caldera and Chicoana department in Salta province. The diagnostic characters are described and illustrated, a keys for identification of species and distribution map are provided [ABSTRACT FROM AUTHOR]

The Pecluma genus in Argentina is represented by 11 species, most are epiphytes in the northern region. Pecluma plumula is a new record for northwestern Argentina. The descriptions, synonymy, key to determine the species, specimens examined, illustrations and distribution maps for each species are presented. Furthemore, taxonomic and nomenclatural notes for typification issues are given. [ABSTRACT FROM AUTHOR]

The presence of Anadenanthera colubrina var. colubrina for the Argentinean flora is confirmed. This variety is distinguished by three morphological characters: structure of the inflorescence, fruit characteristics and venation type of the folioles, being the latter very useful when studying vegetative material. The variety colubrina inhabits the same areas as var. cebil. A distribution map, illustrations and a key to identify the varieties are presented, and lectotypes are designated for Piptadenia macrocarpa and Niopa. [ABSTRACT FROM AUTHOR]