GRAMINE^E. 667 



V 



smooth, oblong, faintly nerved ; lower glume nearly half as long as the 

 abruptly pointed upper one ; paleae of the triandrous sterile flower nearly 

 equal. South Florida. 



P. commutatum, Schultes. Culm smooth (2 high); leaves (3' -6' 

 long) ovate-lanceolate, the margins and sheath ciliate ; panicle diffuse ; spike- 

 lets oblong, sparsely pubescent; the upper glume and lower palea of the neu- 

 tral flower 7-nerved ; perfect flower acute. (P. nervosum, Ell.) Dry woods 

 and margins of fields, Florida to North Carolina. 



P. sphserocarpon, Ell. Culms rigidly erect (l-2 high); leaves 

 rigid, lanceolate, smooth, the rough margins near the base, and sheaths, cili- 

 ate ; panicle oval, diffuse ; spikelets small, oval, almost villous ; upper 

 glume 7-nerved ; upper palea of the neutral flower minute or wanting. 

 Shallow grassy ponds, Georgia and Florida. 



P. consanguineum, Kunth. Smooth or villous ; culms (1-1 high) 

 at length excessively branched; leaves linear, erect; panicle long-pedun- 

 cled, the flexuous widely spreading branches few-flowered ; spikelets obo- 

 vate, pale, pubescent ; upper glume 7-nerved ; upper palea of the neutral 

 flower none ; perfect flower acute. (P. villosfim and angustifolium, Ell. P. 

 setaceum, Muhl. P. subuniflorum, Bosc.) Woods and borders of fields, 

 Florida to North Carolina, and westward. 



P. laxiflorum, Lam. Culms tufted, smooth (1 high) ; leaves lanceo- 

 late, acuminate, ciliate, mostly pale yellowish green (2' -3' long), the villous 

 sheaths shorter than the internodes ; panicle diffuse, plumose-bearded, rather 

 few-flowered ; spikelets scattered, oval, densely pubescent, the upper glume 

 7-nerved ; neutral flower bipaleaceous ; fertile flower acute. (P. pubescens, 

 Michx., the culms pubescent, and the panicle more dense.) Damp soil, 

 Florida, and northward. 



P. ramulosum, Michx. (in part). Low (6'-8' high), tufted, very 

 smooth and shining ; culm mostly purple ; leaves linear ; panicle diffusely 

 branched, many-flowered (l'-2' long); spikelets minute, purple, very 

 smooth, the upper glume and neutral palea 5-nerved. Low sandy pine 

 barrens, Florida and Georgia. 



CENCHRUS, L. 



C. incertUS, M. A. Curtis. Smooth, strict, nearly simple, erect or as- 

 cending (2 -3 long); leaves linear, folded, the lower sheaths longer than 

 the internodes; spike cylindrical, many-flowered; involucre naked and acute 

 at base, the 10 or 11 stout spines ciliate ; spikelets geminate, smooth ; sterile 

 flower triandrous. (C. strictus, Chapm.) Sandy coast, Florida to North 

 Carolina. 



C. myosuroides, H.B.K. Tall (4 -6 high); leaves long, rigid, con- 

 volute ; spikes cylindrical, densely many-flowered ; involucre small, 1-flow- 

 ered, armed with 20, or more, slender spines, as long as its strongly nerved 

 spikelet. (Panicum cenchroides, Ell.) South Florida (Blodgett), Georgia 

 (Elliott). 



