Genera of the North American Paniceae (Poaceae: Panicoideae).
A comprehensive study of generic concepts with an evaluation of taxonomic characters is presented for the Paniceae of North America. An original set of data, consisting of 409 characters recorded for 25 genera, was collected and analysed to produce a bracketed key to the genera. The data were analysed to select the best subset of characters for inclusion in a synoptic key and descriptions. Character concepts and differences among the recognized character states for each of the selected 57 characters are discussed. A synoptic key, showing the distribution of genera for the character states, is presented. Pertinent nomenclatural data and fully comparative descriptions are given. Italicized within each description are the diagnostic characters required for identification. Remarks on the morphology and relationships of each genus are included. New combinations are proposed for Digitaria cognata var. arenicola and 4 species of Urochloa.