Urochloa fusca, the browntop signalgrass,[1] is a wild grass species with a native range extending from Paraguay in South America to the southern United States (Alabama, Arizona, Florida, Georgia, New Mexico, Texas, and Oklahoma),[2][3] and it is now found as a weed in Australia.[2][4] The species is diploid, with a base chromosome number of 9,[5] and utilizes the PCK enzymatic subtype of C4 photosynthesis. Based on a molecular phylogeny of the genus Urochloa, the closest relatives of U. fusca are Urochloa arizonica and Urochloa mollis[6] The genome of U. fusca is currently being sequenced by the Joint Genome Institute.[7][8]
Ecology
Prefers moist and the disturbed areas at low elevations.[4]
^Osvaldo Morrone, Alejandro Escobar, and Fernando O. Zuloaga, Chromosome Studies in American Panicoideae (POACEAE) Annals of the Missouri Botanical Garden 2006 93 (4), 647-657
^Diego L. Salariato, Fernando O. Zuloaga, Liliana M. Giussani, Osvaldo Morrone, Molecular phylogeny of the subtribe Melinidinae (Poaceae: Panicoideae: Paniceae) and evolutionary trends in the homogenization of inflorescences, Molecular Phylogenetics and Evolution, Volume 56, Issue 1, July 2010, Pages 355-369, ISSN1055-7903
