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{{taxobox
|image = Starr 090121-1010 Setaria parviflora cropped.jpg
|status = G5
|status_system = TNC
|regnum = Plantae
|unranked_divisio = Angiosperms
|unranked_classis = Monocots
|unranked_ordo = Commelinids
|ordo = Poales
|familia = Poaceae
|genus = Setaria
|species = S. parviflora
|binomial = Setaria parviflora
|binomial_authority = (Poir.) Kerguélen
|synonyms =- Alopecurus rubicundus Buch.-Ham. ex Wall. nom. inval.
- Cenchrus parviflorus Poir.
- Chaetochloa flava (Nees) Scribn.
- Chaetochloa geniculata (Poir.) Millsp. & Chase
- Chaetochloa gracilis (Kunth) Scribn. & Merr.
- Chaetochloa imberbis (Poir.) Scribn.
- Chaetochloa laevigata (Nutt.) Scribn. nom. inval.
- Chaetochloa occidentalis Nash
- Chaetochloa parviflora (Poir.) Scribn.
- Chaetochloa penicillata (J.Presl) Scribn.
- Chaetochloa perennis (Hall) C.Bicknell
- Chaetochloa purpurascens (Kunth) Scribn. & Merr.
- Chaetochloa ventenatii (Kunth) Nash nom. illeg.
- Chaetochloa versicolor C.Bicknell
- Chamaeraphis gracilis (Kunth) Kuntze ex Stuck. nom. illeg.
- Chamaeraphis imberbis (Poir.) Kuntze ex Stuck.
- Chamaeraphis penicillata (J.Presl) Stuck.
- Chamaeraphis ventenatii (Kunth) Beal nom. illeg.
- Echinochloa geniculata (Poir.) Millsp.
- Panicum adscendens Hoffm. ex Schult. & Schult.f. nom. inval.
- Panicum alopecuroideum Schreb. ex Steud.
- Panicum ascendens Willd. ex Spreng. nom. inval.
- Panicum beccabunga Rendle
- Panicum berteronianum (Schult.) Steud.
- Panicum brachytrichum Steud. nom. inval.
- Panicum brasiliense Spreng.
- Panicum congestum Döll nom. inval.
- Panicum dasyurum Nees
- Panicum flavum Nees
- Panicum fuscescens Willd. ex Steud. nom. inval.
- Panicum geniculatum Poir.
- Panicum geniculatum Willd. nom. illeg.
- Panicum glaberrimum Elliott ex Scribn. & Merr. nom. inval.
- Panicum glaucescens Salzm. ex Döll nom. inval.
- Panicum glaucum Steud. ex Döll nom. inval.
- Panicum gobariense Vanderyst nom. inval.
- Panicum imberbe Poir.
- Panicum laevigatum Elliott nom. illeg.
- Panicum medium Muhl. ex Elliott nom. inval.
- Panicum occidentale (Nash) Nieuwl. nom. illeg.
- Panicum pseudoholcus Steud. nom. inval.
- Panicum raripilum Kunth
- Panicum tejucense Nees
- Panicum ventenatii (Kunth) Steud. nom. illeg.
- Panicum versicolor (C.Bicknell) Nieuwl. nom. illeg.
- Panicum virescens Salzm. ex Döll nom. inval.
- Panicum vulpinum Willd.
- Pennisetum geniculatum (Poir.) J.Jacq.
- Pennisetum laevigatum Nutt.
- Pennisetum parviflorum (Poir.) Trin.
- Setaria affinis Schult.
- Setaria ambigua Schrad.
- Setaria barretoi Boldrini
- Setaria berteroniana Schult.
- Setaria brachytricha Mez ex R.A.W.Herrm.
- Setaria discolor Hack.
- Setaria flava (Nees) Kunth
- Setaria floriana Andersson
- Setaria geniculata P.Beauv.
- Setaria gracilis Kunth
- Setaria imberbis (Poir.) Roem. & Schult.
- Setaria laevigata (Nutt.) Schult.
- Setaria penicillata J.Presl
- Setaria perennis Hall
- Setaria purpurascens Kunth
- Setaria stipaeculmis Müll. Hal.
- Setaria stipiculmis C.Muell.
- Setaria streptobotrys E.Fourn.
- Setaria tejucensis (Nees) Kunth
- Setaria tenella Desv.
- Setaria ventenatii Kunth nom. illeg.
- Setaria vulpina (Willd.) P.Beauv.
|synonyms_ref = [1]
}}Setaria parviflora is a species of grass known by the common names marsh bristlegrass,[2] knotroot bristle-grass,[3] bristly foxtail and yellow bristlegrass. It is native to North America, including Mexico and the United States from California to the East Coast, Central America and the West Indies,[4] and South America.[5]This grass is a perennial with small, knotty rhizomes. It produces stems 30 centimeters to well over one meter tall. The leaf blades are up to 25 centimeters long and under a centimeter wide.[4] The leaves are whitish-green.[6] The inflorescence is a compact, spikelike panicle up to 8 or 10 centimeters long. Surrounding each spikelet are up to 12 yellow or purple bristles.[4] The bristles stay on the stalk after the seeds drop away.[6] This grass grows in moist habitat.[4] It can grow in salty habitat such as salt marshes.[6] References1. ^{{cite web|url=http://www.theplantlist.org/tpl1.1/record/kew-442600|title=The Plant List: A Working List of All Plant Species|accessdate=14 December 2014}}
2. ^{{PLANTS|id=SEPA10|taxon=Setaria parviflora|accessdate=11 November 2015}}
3. ^{{cite web |title=BSBI List 2007 |publisher=Botanical Society of Britain and Ireland |url=http://www.bsbi.org.uk/BSBIList2007.xls |format=xls |archive-url=https://www.webcitation.org/6VqJ46atN?url=http://www.bsbi.org.uk/BSBIList2007.xls |archive-date=2015-01-25 |accessdate=2014-10-17 |deadurl=yes |df= }}
4. ^1 2 3 Setaria parviflora. {{webarchive|url=https://web.archive.org/web/20101116003458/http://herbarium.usu.edu/webmanual/info2.asp?name=setaria_parviflora&type=treatment |date=2010-11-16 }} Grass Manual Treatment.
5. ^{{GRIN | accessdate = 21 January 2018}}
6. ^1 2 Setaria parviflora. USDA NRCS Plant Fact Sheet.
{{Commonscat|Setaria parviflora}}{{Taxonbar|from=Q9076531}} 3 : Setaria|Flora of North America|Flora of South America |