Species delimitation in the Sporobolus aeneus complex [Zoysieae, Chloridoideae, Poaceae] using the phylogenetic species concept

The "Sporobolus aeneus complex" constitutes a morphologically well-defined group of species with lax, exerted, pyramidal panicles with verticillate branches, and comprises 14 species and six infraspecific taxa in southern South America [eastern Bolivia, eastern Paraguay, Uruguay, southern...

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Detalles Bibliográficos
Autor principal: Denham, Silvia S.
Otros Autores: Aliscioni, Sandra Silvina
Formato: Artículo
Lenguaje:Inglés
Materias:
MULTIVARIATE ANALYSES
PHYLOGENETIC SPECIES CONCEPT
POPULATION AGGREGATION ANALYSIS
SOUTH AMERICA
SPOROBOLUS
FUNCTIONAL MORPHOLOGY
GRASS
HERBARIUM
INTRASPECIFIC VARIATION
MULTIVARIATE ANALYSIS
PHYLOGENETICS
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
SPECIES DIVERSITY
TAXONOMY
CHLORIDOIDEAE
POACEAE
SPOROBOLUS CUBENSIS
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2010Denham.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 0 0 |a Species delimitation in the Sporobolus aeneus complex [Zoysieae, Chloridoideae, Poaceae] using the phylogenetic species concept 
520 |a The "Sporobolus aeneus complex" constitutes a morphologically well-defined group of species with lax, exerted, pyramidal panicles with verticillate branches, and comprises 14 species and six infraspecific taxa in southern South America [eastern Bolivia, eastern Paraguay, Uruguay, southern Brazil, northeastern Argentina]. Species delimitation in the complex remains unresolved. To clarify the taxonomy of the group, multivariate analyses of qualitative and quantitative characters from herbaria specimens were performed. We applied the phylogenetic species concept and we used a modified "population aggregation analysis." Five species [S. aeneus, S. cubensis, S. linearifolius, S. multinodis, S. recurvatus] ar e recognized by unique combinations of qualitative character states, and three varieties based on significant mean value differences of quantitative characters. We conclude that leaf blade pilosity, widely used as a diagnostic character in the complex, is affected by external conditions like fire or blade age and is taxonomically unreliable. Two new cominations, Sporobolus aeneus var. angustifolia [Döll] S. Denham and Aliscioni and S. aeneus var. eximius [Nees ex Trin.] S. Denham and Aliscioni are made. Vilfa acuminata Trin. and Vilfa eximia Nees ex Trin. are lectotypified. 
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