Resumo

SALARIATO, Diego; MORRONE, Osvaldo  e  ZULOAGA, Fernando O. Ornamentation pattern of the upper anthecium in Urochloa and related genera (Poaceae, Panicoideae, Paniceae): its systematic value. Darwiniana [online]. 2008, vol.46, n.2, pp.335-355. ISSN 0011-6793.

The ornamentation pattern of the upper anthecium in species of Paniceae belonging to the PCK group, in particular of the genus Urochloa, was analyzed. Nineteen different ornamentation patterns were recognized, of which 11 are reported for the first time. Several epidermal elements are described, including simple papillae, compound papillae and ridges in the anticlinal or periclinal cell walls. The ornamentation patterns were useful for infrageneric delimitation in the genus Urochloa but not to deli-mit the genus from related ones; on the contrary, this character provided more evidence to sustain the paraphyly of the genus. Systematic and phylogenetic value of this character in Urochloa and other rela-ted genera are also discussed.

Palavras-chave : Morphology; Ornamentation pattern; Paniceae; PCK clade; Upper anthecium; Urochloa.

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