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FamilyScientific Name Common NameHabitatDistributionImage
PoaceaeAristida adscensionisSixweeks Three-awnDry habitats; eastwards in disturbed areas.Native of w. United States (?) south into Neotropics. Reported for SC (FNA)image of plant
PoaceaeAristida basirameaForktip Three-awnSandy soils; introduced eastwards.Native of mw. United States. ME and ON south to SC (FNA), AL, TX, and CO (FNA). Reported occurrence in PA is based on misidentification (S. Grund, pers.comm., 2023).image of plant
PoaceaeAristida beyrichianaSouthern WiregrassSandhills, savannas, from very dry to seasonally saturated soils.S. SC south to s. FL, west to s. MS.image of plant
PoaceaeAristida condensataBig Three-awnSand barrens, dry, sandy soils of longleaf pine sandhills, sandy pine rocklands of s. FL.Sc. NC south to s. FL, west to s. MS (Sorrie & Leonard 1999).image of plant
PoaceaeAristida curtissiiCurtiss's Three-awnRoadsides, disturbed areas, bare eroding soil.ME west to WY, south to n. FL, AR, OK, and CO, perhaps largely or adventive east of the Mississippi River.image of plant
PoaceaeAristida dichotomaFork-tip Three-awn, Poverty GrassRoadsides, fields, disturbed areas, bare eroding soil.ME west to WI, south to n. FL and TX.image of plant
PoaceaeAristida gyransCorkscrew Three-awnScrubby flatwoods and other dry pinelands, open sandy firelanes.E. GA and w. Panhandle FL, south to s. FL. In Bryan, Long, and Montgomery counties in e. GA (Sorrie 1998b), and in wc. GA (J. Allison, pers. comm.).image of plant
PoaceaeAristida lanosaWoollysheath Three-awnDry sandy soils of longleaf pine sandhills and fields.NJ south to FL, west to TX, north in the interior to MO and OK.image of plant
PoaceaeAristida geniculataNortheastern Slim-spike Three-awnDry open habitats, disturbed areas.The distribution and habitats of A. geniculata and A. longespica in our area are poorly known, pending further field and herbarium investigation.
PoaceaeAristida longespicaSoutheastern Slim-spike Three-awnDisturbed areas.The distribution and habitats of A. geniculata and A. longespica in our area are poorly known, pending further field and herbarium investigation.image of plant
PoaceaeAristida mohriiMohr's Three-awnLongleaf pine sandhills, Florida scrub, dry pine flatwoods.Panhandle FL and sw. GA west to s. AL; apparently disjunct in SC (Chesterfield and Richland counties).image of plant
PoaceaeAristida oliganthaPrairie Three-awnRock outcrops in thin soil, roadsides, fields, disturbed areas.VT west to SD, south to FL and TX, scattered elsewhere as a weed.image of plant
PoaceaeAristida palustrisLongleaf Three-awnWet pine savannas and flatwoods, limesink depressions.Se. NC south to FL, west to TX; apparently disjunct on the Cumberland Plateau of KY.image of plant
PoaceaeAristida patulaTall Three-awnDry to moist sandy soils of pond margins, pine flatwoods, other pinelands, dunes, pastures.Endemic to FL Panhandle (Dixie, Franklin, Gadsden, Leon, Taylor, and Wakulla counties) (Wunderlin & Hansen 2006) and peninsula.image of plant
PoaceaeAristida purpurascensArrowfeatherDry habitats, especially in dry sandy or rocky soils.MA west to WI and KS, south to FL, TX, and Mexico (CHP, CHH, COA, SON)image of plant
PoaceaeAristida purpurea var. longisetaRed Three-awnRocky and sandy areas, eastwards adventive in disturbed areas.MB west to BC, south to TX, CA, and Mexico; adventive eastwards. Also reported from NC, but the collection is from a Soil Conservation Service test nursery, and there is no evidence of naturalization.image of plant
PoaceaeAristida ramosissimaS-curve Three-awnPine flatwoods, dry upland soils.OH, s. IN, s. IL, c. MO. se. KS south to Pamhandle FL (Bay County) (Wunderlin & Hansen 2011), nc. MS (Morris & MacDonald 2012), LA, and c. TX.image of plant
PoaceaeAristida rhizomophoraFlorida Three-awnWet pine flatwoods and savannas. Wet fringes of dry prairies.A Florida endemic, north to Baker, Duval, and Nassau counties.image of plant
PoaceaeAristida simplicifloraSouthern Three-awn, Chapman's Three-awnWet pine savannas.Sw. GA west through the FL Panhandle and c. AL to s. MS (Sorrie & Leonard 1999), and south into c. peninsular FL and s. peninsular FL (Wilder & McCollum 2023); northward apparently as a rarity in se. NC and e. SC (Berkeley County; McMillan & Porcher 2005) and se. NC. A. simpliciflora was believed to be a Gulf Coastal Plain endemic until found by R. LeBlond in 1999 in wet savannas in se. NC (Green Swamp savannas, Brunswick County; Old Dock Savanna, Columbus County; and The Neck Savanna, Pender County). It is reported for sw. GA (Jones & Coile 1988, Kartesz 1999). Harper also reports it for c. GA.image of plant
PoaceaeAristida spiciformis var. spiciformisBottlebrush Three-awn, Spike Three-awnWet pine savannas and seepage areas.E. SC (McMillan et al. 2002) south to s. FL, west to MS; West Indies (Cuba, Puerto Rico). Allred (1986) also reports this species from NC, but the documentation is unknown to me.image of plant
PoaceaeAristida strictaCarolina Wiregrass, Pineland Three-awnCoastal Plain pinelands of nearly all sorts, ranging from the driest white-sand sandhills to seasonally saturated pine savannas dominated by a mixture of longleaf pine and pond pine, largely or entirely replaced in the wettest savannas by Sporobolus teretifolius, S. pinetorum, Calmovilfa brevipilis, Muhlenbergia expansa, and Ctenium aromaticum; also in Piedmont areas adjacent to the Coastal Plain and formerly supporting fire-maintained longleaf pine woodlands.Ne. NC (south of Albemarle Sound and the Roanoke River), south to ne. SC (Lee and Kershaw counties)image of plant
PoaceaeAristida tenuispicaSouthern ArrowfeatherLongleaf pine sandhills, pine flatwoods, Florida wet prairies, other sandy habitats.NC south to s. FL and west to MS.image of plant
PoaceaeAristida tuberculosaDune Three-awn, Sand Three-awn, Seaside NeedlegrassLongleaf pine sandhills, coastal dunes, other dry, sandy habitats such as sandy roadsides.Se. NH south to NJ and disjunct in e. VA in the outer Coastal Plain; from sc. NC south to c. FL and Panhandle FL, west to s. MS (Sorrie & Leonard 1999), mostly in the inner Coastal Plain; and also near the Great Lakes in sw. MI, n. IN, n. IL, s. WI, se. MN, and e. IA.image of plant
PoaceaeAristida virgataMoist to wet pine savannas, wet pine flatwoods, mountain bogs (Henderson Co., NC), other moist habitats.S. NJ south to s. FL, west to TX, primarily on the Coastal Plain; Central America.image of plant
PoaceaeAristida divaricataWest of our region, in dry hills and plains, especially in pinyon-juniper woodlands; collected in our region only from a test nursery.Sw. United States to Guatemala. Allred (1986) reports the collection of this sw. North American species from a Soil Conservation Service test nursery in Chapel Hill, NC.image of plant
PoaceaeAristida desmanthaCurly Three-awnDry pinelands, other dry sites.IL, MO, and sc. NE south to w. LA, TX, and n. Mexico.image of plant
PoaceaeAristida floridanaKey West Three-awnRockland hammocks, dry disturbed areas over limestone.Endemic to s. FL. Sometimes considered to also occur in the Yucatan peninsula.image of plant
PoaceaeAristida purpurea var. purpureaPurple Three-awnSandy or rocky soils.KS and CA south to LA, TX, NM, AZ, CA, and Mexico.image of plant
PoaceaeAristida purpurea var. wrightiiWright's Three-awnCalcareous soils.OK, CO, s. UT, s. NV, and s. CA south to s. TX and Mexico.
PoaceaeAristida ternipes var. ternipesSpidergrassS. FL, TX, NM, and AZ south through Mexico and Central America to n. South America; West Indies. Reported for s. FL (Monroe County).
PoaceaeAristida purpurea var. nealleyiNealley's Three-awnRocky slopes, woodlands and scrub.KS and CA south to TX, NM, AZ, CA, and Mexico.
PoaceaeAristida purpurea var. fendlerianaRocky calcareous areas, prairies.SD, MT, and CA south through OK, TX, NM, and AZ into Mexico.

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