Summary: Distribution and morphological variability in populations of Solanum commersonii (Solanaceae) in the Pampas region of Argentina. Solanum commersonii is a wild tuber bearing species, widely distributed in the Distrito Pampeano Austral and Oriental of Argentina. It is found growing in different habitats: on coastal dunes and in Paspalum quadrifarium tussocks distributed both in the lowland as well as on the hillsides. In order to compare the populations from the different sites, 17 populations of S. commersonii, one of S. malmeanum and one of S. chacoense, the last two species included as outgroups, were studied. Morphological and reproductive characters were registered in 6 to 10 plants in each population studied and the data were analyzed by means of an analysis of variance, components and coordinates. A minimum spanning tree was calculated to visualize the groups formed. The results obtained with the morphological analysis revealed that the intraspecific variability detected in the populations was not associated with the particular habitat where the species grows.Key words: Distribution, intraespecific variability, lowland areas and hills, sandy dunes, Solanum commersonii.Resumen: Solanum commersonii es una especie tuberosa silvestre de papa ampliamente distribuida en el Distrito Pampeano Austral y Oriental de la Argentina, creciendo en ambientes muy diversos: en la costa sobre médanos e integrando pastizales relictuales de paja colorada tanto en campos bajos con limitantes edáficas como en las laderas de la sierras. Con el objetivo de comparar las poblaciones provenientes de diferentes sitios y ambientes se analizaron 17 poblaciones de Solanum commersonni, una entrada de Solanum malmeanum y una de Solanum chacoense, estas dos últimas utilizadas como grupos taxonómicamente relacionados. Se registraron 41 caracteres morfológicos vegetativos y reproductivos, en seis a diez plantas por población. Los datos fueron analizados mediante un análisis de varianza, de coordenadas y componentes principales. Se calculó un árbol de mínima distancia para visualizar los posibles agrupamientos. Los resultados del análisis morfológico detectaron que la variabilidad intraespecifica en las poblaciones estudiadas de S. commersonii no está asociada a los diferentes ambientes donde crece la especie.Palabras clave: Ambientes serranos, campo bajo, distribución, dunas costeras, Solanum commersonii, variabilidad intraespecífica.
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