Resumen

LOPEZ, María Gabriela  y  GONZALEZ, Ana Maria. Micromorfología y estructura de los frutos en Bulbostylis (Cyperaceae) y su valor sistemático en las especies de América austral. Bol. Soc. Argent. Bot. [online]. 2017, vol.52, n.1, pp.69-87. ISSN 1851-2372.

The genus Bulbostylis Kunth includes about 150 species that inhabit tropical and subtropical areas worldwide. In Bulbostylis, as in other kinds of sedges, the exomorphology of fruits is one of the steadiest characters for infrageneric classification. This research was focused on evaluating achene micromorphology in twenty Bulbostylis species of Southern America (Argentina, Chile, Paraguay, Uruguay and Paraná, Santa Catarina and Rio Grande do Sul in Brazil). Based on studies with optical and scanning electron microscopy, several groups are proposed, considering the micromorphology of the achenes and presence and type of silicophytoliths. Chemical microanalysis of fruits with EDX/MEB was also performed. The description system based on exomorphological characters, applicable to fruits and seeds, is updated.

Palabras clave : Southern America; Anatomy; Achenes; Bulbostylis; Cyperaceae; SEM/EDX; Micromorphology.

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