HITCHCOCK REVISIONS OF NORTH AMERICAN GRASSES. 127 



Oplismenus setarius Roem. & Schult. Syst. Veg. 2: 481. 1817. Based on Panicum 

 setarium Lam. 



Orthopogon parvifolium Nutt. Gen. PI. 1 : 55, errata. 1818. Nuttall at first referred 

 this to 0. hirtellum (Panicum hirtellum L.), giving the range as Florida to South Caro- 

 lina. In the errata he changes the name to 0. parvifolium and gives a new description 



Orthopogon setarius Spreng. Syst. Veg. 1: 306. 1825. Based on Panicum setarium 

 Lam. 



Oplismenus parvifolius Kunth, Rev. Gram 1 : 45. 1829. Based on Orthopogon parvi- 

 folius Nutt. ; placed by Kunth among species dubiae. 



Panicum nuttallianum Steud. Nom. Bot. ed. 2. 2: 260. 1841. Based on Ortho- 

 pogon parvifolius. 



DESCRIPTION. 



Culms slender and lax, the flowering branches ascending or nearly prostrate, usually 

 not more than 10 to 20 cm. long, sometimes as much as 30 cm., glabrous or pubescent 

 in lines; sheaths glabrous, villous on the margin, pubescent about the collar; ligule 

 a very short ciliate membrane ; blades ovate to ovate-lanceolate, thin, mostly 1 to 3 

 cm. long, 4 to 10 mm. wide, sparsely pilose on both surfaces or glabrate; panicle long- 

 exserted, usually not over 5 cm. long, rarely as much as 8 cm., the axis scabrous or 

 puberulent; racemes usually 3 to 5, rarely as many as 8, short and subglobose, distant 

 or the upper approximate, the lower internode sometimes as much as 2 cm. long, the 

 rachis usually 2 to 3 mm. long, rarely as much as 5 mm. long (or a little longer in some 

 United States specimens), puberulent, pubescent, or villous at base; spikelets rarely 

 as many as 8 on a rachis, usually not more than 5, the lowermost sometimes reduced to 

 awns; glumes more than half as long as the sterile lemma, appressed-hispidulous, often 

 more or less pilose along the margin, more or less notched at apex, the first 3-nerved, 

 the awn mostly 4 to 8 mm. long, smooth, the second 5-nerved, the awn much shorter, 

 usually 2 to 3 mm. long; sterile lemma 2 to 3 mm. long, 7-nerved, appressed-pilose 

 above, the awn short or wanting; fruit about 2.5 mm. long. 



DISTRIBUTION. 



Shaded places along the coast, North Carolina to Florida and Texas; southern 



Mexico to Guatemala; West Indies; Trinidad to Paraguay. 



North Carolina: Ocracoke Island, Kearney 2321. 



Georgia: Lumpkin, Latimer in 1885. Bainbridge, Harper 1235. Brunswick, Chase 

 7086. Union, Harper 1084. Georgetown, Harper 1746. 



Florida: Jupiter, Curtiss 5553. Orange County, Baker 30. Tampa, Combs 1402. 

 Tallahassee, Nash 2524. Mouth St. Johns River, Curtiss 3595. Old Town, 

 Combs 864. Fort Myers, Hitchcock 467. Manatee, Rugel 379. Miami, Hitchcock 

 672. Eustis, Chase 4044. Fellsmere, Tracy 9307. Key West, Blodgett. Jack- 

 sonville, Curtiss 4037, 5301. Brevard County, Fredholm 5504, 6139. Orange 

 Glade, Eaton 593. Sebastian, Fredholm 5504. Bartow, Combs 1239. Homosassa, 

 Combs 968. Grasmere, Combs 1044. Palm Beach, Hitchcock 2337. Gainesville, 

 Chase 4243. 



Alabama: Mobile, Mohr in 1878. Tuscaloosa, Smith. 



Mississippi: Ocean Springs, Tracy 4533. Biloxi, Chase 4361. Nicholson, Kearney 366. 



Arkansas: Fulton, Bush 982. 



Louisiana: Plaquemines County, Langlois 53. Houma, Wurzlow in 1913. Burnside, 

 Combs 1415. 



Texas: Houston, Fisher 1805 ; Hall837. Terrell, ItyZer in 1904. Columbia, Bush 299, 

 1428. Hockley, Thurow. Georgetown, Palmer 1339 in 1880. Beckville, Rever- 

 chon in 1902. San Antonio, Hitchcock 5249; Plank 57, 95; Bush 1218. New 

 Braunfels, Lindheimer 1263. 



Veracruz: Orizaba, Seaton 63; Bgtteri 136; Midler 2021. Cordoba, Hitchcock 6445. 



