of Mississippi and Louisiana 87 



dm. tall ; leaves crowded below, scattered or wanting above ; 

 sheaths with the margin often ciliate ; ligule a narrow scarious 

 ring less than o. 5 mm. wide ; blades firm, flat, lanceolate, usually 

 2-6 cm. long, sometimes longer, 3-8 mm. wide ; panicle dense, 

 2-9 cm. long, its branches ascending ; spikelets crowded, glabrous, 

 about 2.5 mm. long and a little over 1 mm. wide, the first scale 

 one half as long as the spikelet, or nearly so, the apex acute at a 

 broad angle, apiculate. 



In sand along the seashore acting as a sand-binder, Mississippi. 

 Also in Mexico. Collected on Petit Bois Island, Mississippi, 

 by S. M. Tracy, on May 8, 1898, no. 4566, and distributed as P. 

 repens confertum. While resembling P. repens in general habit, 

 its smaller dense panicle and the larger acute first scale of the 

 spikelet will at once distinguish it. In P. repens the panicle is 

 long and slender, and the first scale of the spikelet is only about 

 a fourth as long as the spikelet and truncate at the apex. 



Very common on beaches and damp, sandy places on all the 

 islands, the horizontal creeping rootstocks often three metres in 

 length and rarely producing tubers. 



P. hians Ell. Common in wet, sandy places. 



P. Nashianum Scribn. Dry, sandy banks, Cat Island. Com- 

 mon on dry sandy places, usually in the shade of palmettoes or 

 other shrubs. Pine barrens. 



\P. proliferum Lam. Observed only near an old house at 

 South Pass. A straw 



P. repens L. Occasional on the dunes and dry sand ridges of 

 Ship and Cat Islands, the abundant tubers on the perpendicular 

 rootstocks often buried to a depth of eight decimetres. 



P. sphaerocarpon Ell. Cat and Breton Islands. 



P. Walteri Pursh. In wet, sandy places, Breton Island. 

 Paspaluvi ciliatifoliam Michx. Common on the larger islands. 



P. compressum Nees. Occasional on the larger islands, abun- 

 dant on the mud lumps, and at Port Eads. 



P. Cnrtissianum Steud. Cat Island. 



^ ^ 



. 



very 



P. distichum L. On wet, black, heavy soil on several islands ; 



P- Floridanum Michx. Cat Island. 



Islands. 



Walt. On margins of ponds, Ship and Cat 



