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Family	Scientific Name	Common Name	Habitat	Distribution	Image
Poaceae	Aristida adscensionis	Sixweeks Three-awn	Dry habitats; eastwards in disturbed areas.	Native of w. United States (?) south into Neotropics. Reported for SC (FNA)
Poaceae	Aristida basiramea	Forktip Three-awn	Sandy 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).
Poaceae	Aristida beyrichiana	Southern Wiregrass	Longleaf pine sandhills, savannas, flatwoods, and seepages, from very dry to seasonally saturated soils.	S. SC south to s. FL, west to s. MS.
Poaceae	Aristida condensata	Big Three-awn	Sand 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).
Poaceae	Aristida curtissii	Curtiss's Three-awn	Roadsides, 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.
Poaceae	Aristida desmantha	Curly Three-awn	Dry pinelands, other dry sites.	IL, MO, and sc. NE south to w. LA, TX, and n. Mexico.
Poaceae	Aristida dichotoma	Fork-tip Three-awn, Poverty Grass	Roadsides, fields, disturbed areas, bare eroding soil.	ME west to WI, south to n. FL and TX.
Poaceae	Aristida divaricata		West of our region, in dry hills and plains, especially in pinyon-juniper woodlands; collected in our region only from a test nursery.	Sc. And sw. United States to Guatemala. Allred (1986) reported the collection of this sw. North American species from a Soil Conservation Service test nursery in Chapel Hill, NC.
Poaceae	Aristida fendleriana		Rocky calcareous areas, prairies.	SD, MT, and CA south through OK, TX, NM, and AZ into Mexico.
Poaceae	Aristida floridana	Key West Three-awn	Rockland hammocks, dry disturbed areas over limestone.	Endemic to s. FL. Sometimes considered to also occur in the Yucatan peninsula.
Poaceae	Aristida geniculata	Northeastern Slim-spike Three-awn	Dry 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.
Poaceae	Aristida glauca	Nealley's Three-awn	Rocky slopes, woodlands and scrub.	KS and CA south to TX, NM, AZ, CA, and Mexico.
Poaceae	Aristida gyrans	Corkscrew Three-awn	Scrubby 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.). POWO (2024) also alleges this species to be distributed in Cuba and Hispaniola (needing investigation).
Poaceae	Aristida havardii			Reported for c. OK by Kartesz (2022); needing investigation.
Poaceae	Aristida lanosa	Woollysheath Three-awn	Dry sandy soils of longleaf pine sandhills and fields.	NJ south to FL, west to TX, north in the interior to MO and OK.
Poaceae	Aristida longespica	Southeastern Slim-spike Three-awn	Disturbed areas.	The distribution and habitats of A. geniculata and A. longespica in our area are poorly known, pending further field and herbarium investigation.
Poaceae	Aristida longiseta	Red Three-awn	Rocky 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.
Poaceae	Aristida mohrii	Mohr's Three-awn	Longleaf pine sandhills, Florida scrub, dry pine flatwoods.	Panhandle FL and sw. GA west to s. AL; apparently disjunct in SC (Chesterfield and Richland counties). POWO (2024) also alleges this species to be in Cuba and Hispaniola; this needs investigation.
Poaceae	Aristida oligantha	Prairie Three-awn	Rock outcrops in thin soil, roadsides, fields, disturbed areas.	VT west to e. WY, south to FL, TX, and n. Mexico; distribution in w. North America is probably adventive.
Poaceae	Aristida palustris	Longleaf Three-awn	Wet pine savannas and flatwoods, limesink depressions.	Se. NC south to FL, west to TX. A record from the Cumberland Plateau of KY (Laurel County) is a false report.
Poaceae	Aristida patula	Tall Three-awn	Dry to moist sandy soils of pond margins, pine flatwoods, sabal palm hammock margins, other pinelands, dunes, pastures.	Endemic to FL Panhandle (Dixie, Franklin, Gadsden, Leon, Taylor, and Wakulla counties) (Wunderlin & Hansen 2006) and peninsula.
Poaceae	Aristida purpurascens	Arrowfeather	Dry habitats, especially in dry sandy or rocky soils.	MA west to WI and KS, south to FL, TX, and Mexico (CHP, CHH, COA, SON)
Poaceae	Aristida purpurea	Purple Three-awn	Sandy or rocky soils.	KS and CA south to LA, TX, NM, AZ, CA, and Mexico.
Poaceae	Aristida ramosissima	S-curve Three-awn	Pine flatwoods, dry upland soils.	OH, s. IN, s. IL, c. MO. se. KS south to Panhandle FL (Bay County) (Wunderlin & Hansen 2011), nc. MS (Morris & MacDonald 2012), LA, and c. TX. Adventive in Fairfax County, VA.
Poaceae	Aristida rhizomophora	Florida Three-awn	Wet pine flatwoods and savannas, wet fringes of dry prairies.	A Florida endemic, north to Baker, Duval, and Nassau counties.
Poaceae	Aristida simpliciflora	Southern Three-awn, Chapman's Three-awn	Wet 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.
Poaceae	Aristida spiciformis var. spiciformis	Bottlebrush Three-awn, Spike Three-awn	Wet 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 reported this species from NC, but the documentation is unknown to us.
Poaceae	Aristida stricta	Carolina Wiregrass, Pineland Three-awn	Coastal 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)
Poaceae	Aristida tenuispica	Southern Arrowfeather	Longleaf pine sandhills, pine flatwoods, Florida wet prairies, other sandy habitats.	NC south to s. FL and west to MS.
Poaceae	Aristida ternipes	Spidergrass		TX, NM, and AZ south through Mexico and Central America to n. South America; West Indies. Reported for s. FL (Monroe County), but based on misapplication of A. floridana (Wunderlin et al. 2024).
Poaceae	Aristida tuberculosa	Dune Three-awn, Sand Three-awn, Seaside Needlegrass	Longleaf 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.
Poaceae	Aristida virgata		Moist 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 (needing confirmation).
Poaceae	Aristida wrightii	Wright's Three-awn	Calcareous soils.	OK, CO, s. UT, s. NV, and s. CA south to s. TX and Mexico.