11(3 PAXK'ACFLE. 



Culms slender, usually creeping iit tlu> base, 30-00 cm. high. 

 Siicaths shorter than the internodes; blades "^-.S cm. h)ng, 5-15 

 mm. wide, lanceolate, Hat, glaI)rous, except cilia on the margins 

 near tiie broad l)ase, at the throat and sometimes on the sheath. 

 Panicle exserted, of 3-10 simple, crowded, si)ikes, 1-4 cm. long, 

 lS})ike]cts single or 'i-'] together in alternate rows on two sides of a 

 tlexuosc. rough, triangular rachis, ))ediccls unequal, very short, 

 often bearing bristles, smooth, llattened, oval, almost acute, con- 

 taining a staminate and a perfect tlowcr, tirst ejni>ty glume inem- 

 brajious. very short, broad, second broad-oval, 5-T-nerved; floral 

 glume of the hnvcr tloret ovate, 5-nerved ; i)alea as long. Stamens 

 3. I'pper tloret oval, finely rugose, mucrouate or obtuse, 1.5 mm. 

 long, 



Jjouisiana, J. />. fji)i///(iis. 



Found in the southern l'. S. , West Indies, Brazil, Egypt, 

 Arabia, Kast Indies, Australia. 



IS. 1*. (iKossAUHM L. Am(cn, Acad. 5: 39-? (1750). /'. rv/'.v- 

 pifosiiui Sprcng. ex Steud. Nom. Kd. 2, 'i : "353 (1841). 



Culms smooth, rather slender. 10-30 cm. high, branching from 

 a decumbent or cree]>ing base, the lower internodes about 3 mm. 

 long. Margins of the sheaths and ligulc hairy ; blades Hat, ovate- 

 lanceolate, acute, 2-5 cm. long, 5-10 mm. wide, the margins near 

 the base pubescent. I'anicle much or little exserted above l;he short 

 sheath or the lower partially included, consisting of about (5 ap- 

 proxinuite spikes, each 2-!} cm. long. Spikelets mostly in j)airs on 

 two sides of a slender, tlexuose, triangular rachis, 1 subsessile, 1 

 borne on a pedicel 1-2 cm. long, elliptieal-obovate, mucronate, 3 

 mm. long, first glume broad, about one-third, of the lengtli of the 

 sj)ikelet, 5-7-ni!rved, secoiul glume ovate, acute, S-!l-nerved: lloral 

 glume of the neuter spikelet a little shorter, 5-iierved, its ])alea 

 shorter and much narrower; fertile floret firm, elliptical, trans- 

 versely wrinkled, 2.5 mm. long. 



/'. (uhpersiim Trin. (Jram. l*ani(!.. as figured, appears to bo tlie 

 same as *^he above, only the leaves are longer and wider, the spikelets 

 2-3 in mimber and longer. 



Introduced into Philadelphia, Penn., on ballast-ground. 



