Resumen

GONZALEZ, Ana Maria  y  OCANTOS, María Natalia. Extrafloral nectaries in Piriqueta and Turnera (Turneraceae). Bol. Soc. Argent. Bot. [online]. 2006, vol.41, n.3-4, pp.269-284. ISSN 1851-2372.

The anatomical and morphological characters of the extrafloral nectaries were studied in 4 species of Piriqueta , and in 16 which belong to six of the seven series of Turnera (Turneraceae) that present these glands. They were classified according to its form and degree of development and a new type of "pore" was described: foveolate. Based on morpho-anatomical characters, a probable morphological sequence was proposed. This would locate the species with flattened EFN and without "pores" in a lower position; after that, the species with flattened nectaries and foveolate "pores" are found; in an intermediate position the elevated extrafloral nectaries (EFN) - sphericals or hemisphericals as well as cupuliforms -were found; finally, the cupuliform EFN with crateriform or mesetiform "pore" are found. Several species of diverse series presented variable characters, being located in an unlike position in the proposed morphological sequence; species with heterogeneous characters were also observed, being difficult to establish their location in the sequence.

Palabras clave : Turneraceae; Extrafloral nectaries; Pores; Anatomy; Colleters.

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