322 MISC. PUBLICATION 243, U.S. DEPT. OF AGRICULTURE 
Awns antrorsely scabrous; racemes villous with long hairs; plants annual. 
1. O. BURMANNI. 
Awns smooth or obscurely roughened; racemes not villous or with a few long 
hairs only; plants perennial. 
Rachis of racemes mostly 2 to 3 mm long, bearing usually not more than 5 
spikelets; blades 1 to 3 cm long, 4 to 10 mm wide______ 2. O. SETARIUS. 
Rachis of lower racemes more than 1 cm long, bearing usually more than 8 
spikelets; blades mostly more than 4 cm long, 1 to 2 em wide. 
3. O. HIRTELLUS. 
1. Oplismenus burmanni (Retz.) Beauv., Ess. Agrost. 54. 1812. 
Panicum burmanni Retz., Obs. Bot. 3: 10. 1783. India. 
Orthopogon burmanni Trin., Fund. Agrost. 181. 1820. 
Low, creeping, freely branching annual; sheaths pilose; blades 
broadly lanceolate-elliptic; racemes 3 to 5, pale villous, ascending, 
approximate along a flexuous axis; awns slender, about 1 cm long. 
Waste places, open ground, and partial shade, a common weed at 
low altitudes in the Tropics of both hemispheres, introduced in North 
America. Cuba and Hispaniola. 
Cusa: Papayo, Ekman 10335. 
Harti: Pétionville, Hkman H 2346. St. Michel de l’Atalaye, 
Leonard 7224, 7542. Furcy, Leonard 4343, 4645. 
Dominican Repusiic: Ocoa, Tuerckheim 3610. Constanza, 
Tuerckheim 2883. Majagiitas, Ekman H 13626. 
2. Oplismenus setarius (Lam.) Roem. and Schult., Syst. Veg. 2: 481. 
1817. 
Panicum setarvum Lam., Tabl. Encycl. 1: 170. 1791. Tropical 
America. 
Orthopogon setarius Spreng., Syst. Veg. 1: 306. 1825. 
Slender creeping branching perennial, the ascending flowering 
culms 20 to 30 cm high; blades 1 to 3 cm long, 4 to 10 mm wide, con- 
spicuously undulate-margined; racemes distant, very short, the 
spikelets appearing to be in clusters on the rather strict axis; awns 4 
to 8 mm long (fig. 295). 
Shady places, southern United States, Mexico, and the West 
Indies to Paraguay. 
Bermupa: Brown and Britton 13; Harris 424; Collins 150. 
Banamas: Bbritton 3200. 
Cusa: Pinar del Rio, Hitchcock 23311, 23316. Cojimar River, 
Léon 4720. Campo Florido, Léon 4139. Caibarién, Fernando 141. 
Sierra Maestra, Léon 10380. Bayate, Ekman 3411. Guara, Hitch- 
cock 23401. Prov. Santa Clara, Jack 6351. Eastern Cuba, Wright 
1543. 
JAMAICA: Troy, Hitchcock 9783; Mazon 2951; Harris 12577. 
Clyde River, Harris 11446. Bryans Hill, Harris 6826. Hardware 
Gap, Harris 118438. Stony Hull, Harris 11339. Mount Hybla, 
Harris 11307. Kingston, Hitchcock 9468. Claremont, Hitchcock 
9521. Abbey Green, Mitchcock 9358. Castleton, Harris 11342; 
Hitchcock 9388 (Amer. Gr. Nat. Herb. 600). Savanna-la-Mar, 
Hitchcock 9871. Barican, Hitchcock 9568. Montego Bay, Hitch- 
cock 9681. Ipswich, Hitchcock 9621. Newcastle, Hitchcock 9337. 
Ewarton, Hitchcock 9415. Catherines Peak, Hitchcock 9731, 9737. 
Blue Hole, Fredholm 3196. Ferry, Ridley 56. Roaring River Falls, 
Ridley 54. Farm Hill, Orcutt 3701. Content Gap, Harris 11364. 
Gordon Town, Hart 578. 
