Setaria pumila

{{Short description|Species of grass}}

{{Speciesbox

|image = Setaria pumila 20141024.jpg

|genus = Setaria

|species = pumila

|authority = (Poir.) Roem. & Schult.

|synonyms = {{hidden begin|title = List}}

• Oplismenus helvolus (L.f.) P.Beauv.
• Panicum flavescens Moench nom. illeg.
• Panicum helvolum L.f.
• Panicum holcoides J.Jacq. nom. illeg.
• Panicum luteum Gueldenst. nom. inval.
• Panicum pallidifuscum Schumach.
• Panicum pumilum Poir.
• Panicum rubiginosum Steud.
• Pennisetum helvolum (L.f.) R.Br.
• Setaria auricoma Link ex A.Braun
• Setaria boninensis Nakai nom. inval.
• Setaria breviglumis St.-Lag.
• Setaria dasyura Schlecht.
• Setaria erythraeae Mattei
• Setaria helvola (L.f.) Roem. & Schult.
• Setaria laeta de Wit
• Setaria pallide-fusca (Schumach.) Stapf & C.E. Hubb.
• Setaria pallidifusca (Schumach.) Stapf & C.E.Hubb.
• Setaria rubiginosa (Steud.) Miq.
• Setaria sciuroidea C.Muell.
• Setaria ustilata de Wit

{{hidden end}}

| synonyms_ref = {{cite web

|url=http://www.theplantlist.org/tpl1.1/record/kew-442645

|title=The Plant List: A Working List of All Plant Species

|accessdate=14 December 2014}}

}}

Setaria pumila is a species of grass known by many common names, including yellow foxtail,{{PLANTS|id=SEPU8|taxon=Setaria pumila |accessdate=2 February 2016}} yellow bristle-grass,{{BSBI 2007 |access-date=2014-10-17 }} pigeon grass, and cattail grass. It is native to Europe, but it is known throughout the world as a common weed. It grows in lawns, sidewalks, roadsides, cultivated fields, and many other places. This annual grass grows {{convert|20|cm|in|0|abbr=off}} to well over {{convert|1|m|yd|0|abbr=off}} in height, its mostly hairless stems ranging from green to purple-tinged in color. The leaf blades are hairless on the upper surfaces, twisting, and up to {{convert|30|cm|in|0|abbr=off}} long. The inflorescence is a stiff, cylindrical bundle of spikelets {{convert|2 to 15|cm|in|frac=4|abbr=off}} long with short, blunt bristles. The panicle may appear yellow or yellow-tinged.

In New Zealand S. pumila can cover 20–40% of otherwise productive dairy farming pasture causing a loss in milk production.{{cite web|url=http://www.agresearch.co.nz/our-science/biocontrol-biosecurity/weed-control/Pages/yellow-bristle-grass.aspx|title=Weed control – Yellow bristle grass|publisher=AgResearch|accessdate=20 April 2012|url-status=dead|archiveurl=https://web.archive.org/web/20120829171842/http://www.agresearch.co.nz/our-science/biocontrol-biosecurity/weed-control/Pages/yellow-bristle-grass.aspx|archivedate=29 August 2012}}