Abstract

GIRALDO CANAS, DIEGO. The Colombian species of the genus Digitaria (Poaceae: Panicoideae: Paniceae). Caldasia [online]. 2005, vol.27, n.1, pp.25-87. ISSN 0366-5232.

A systematic study of the Colombian species of the genus Digitaria is presented. The aspects related to the classification, nomenclature, generic affinities, and macro and micromorphological variation are discussed. Some anatomical features of the spikelet and upper anthecium are analyzed. The genus Digitaria is represented in Colombia by 18 species and five sections: Digitaria sect. Calvulae (one species), Digitaria sect. Digitaria (seven species), Digitaria sect. Ischaemum (three species), Digitaria sect. Ternatae (four species), and Digitaria sect. Trichachne (three species). Two species are endemic to Colombia (Digitaria cardenasiana and Digitaria andicola). Digitaria argillacea, Digitaria neesiana, and Digitaria fragilis are excluded from Colombian Flora. Keys to recognize all sections and species that inhabit Colombia are given, as well as description of the species, iconography, uses, vernacular names, specimens examined, geographical distribution, and morphological and ecological observations. The phenomenon of 3-flowered spikelets is recorded for the genus Digitaria and it was verified in two species: Digitaria dioica and Digitaria nuda.

Keywords : Digitaria; Poaceae; Paniceae; Neotropical grasses; Flora of Colombia.

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