Urochloa fusca

{{Short description|Species of grass}}

{{Speciesbox

|image = Vegetative Urochloa fusca.JPG

|genus = Urochloa

|species = fusca

|authority = B.F. Hansen & Wunderlin

|synonyms = Brachiaria fasciculata
Panicum fasciculatum
Urochloa fasciculata

}}

Urochloa fusca, the browntop signalgrass,{{PLANTS|id=URFU2|taxon=Urochloa fusca|accessdate=27 July 2015}} 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),{{Cite web | url=http://grassworld.myspecies.info/en/content/urochloa-fusca |title = Urochloa fusca | GrassWorld}}{{Cite web | url=https://www.wildflower.org/plants/result.php?id_plant=URFU2 |title = Lady Bird Johnson Wildflower Center - the University of Texas at Austin}} and it is now found as a weed in Australia.{{Cite web|url=http://herbarium.usu.edu/treatments/Urochloa.htm|title=Herbarium}} The species is diploid, with a base chromosome number of 9,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 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 mollisDiego 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, {{ISSN|1055-7903}} The genome of U. fusca is currently being sequenced by the Joint Genome Institute.{{Cite web | url=https://www.ncbi.nlm.nih.gov/bioproject/234780 |title = Urochloa fusca LBJWC-52 (ID 234780) - BioProject - NCBI}}{{Cite web | url=https://gold.jgi-psf.org/project?id=Gp0050856 | title=JGI GOLD | Project}}