GOG GRAMINEiE. 



P. conjugatum, Btrp. Smooth and branching (2° long) ; leaves thin, 

 linear; spikes 2-;), fiat, the two terminal ones conjugate; spikelets minute, 

 in two rows, ovate, long-fringed. — New Orleans [Dr. little). Introduced. 



P. dilatatum, I'oir. ("ulms stout (3° -4° high); leaves flat, linear lan- 

 ceolate, sniootli ; spikes 4-6, racemose; spikelets in 4 rows, ovate, acute, 

 villous, much wider tlian tlie flat racliis ; glumis and sterile palea 5-nerved, 

 longer than the roundish perfect flower. — Alabama, New Orleans, and 

 westward. 



PANICUM, L. 



P. serotinum, Michx. rereimial, creeping, much branched ; leaves 

 sliort (1' long), lanceolate, villous, like the sheaths; spikes mostly 5, digi- 

 tate ; spikelets niiimte ; glume half as long as the paleie. (Digitaria villosa, 

 Ell.) — Fields and road-sides, Florida to North Carolina. 



P, prostratum, L. Creeping, branching; leaves short (\'-2' long), 

 ovate-lanceolate, cilia te ; panicle short, composed of 5-10 simj)le racemes; 

 spikelets ovate-oblong, acute, short-pedicclled ; upper glume and lower palea 

 of the triandrous sterile flower 5 nerved. (!'. Aurelianum, I/ale.) — Mobile 

 and New Orleans. 



P. paspaloides, Pers. Culms erect; leaves long, acuminate; panicle 

 narrow, the branches appresseil ; spikelets in two rows, ovate ; glume 5- 

 nerved ; sterile flower triandrous, much shorter than the fertile one. — South 

 Florida {Blodrjett, Garher). 



P. repens, L. Culms erect from creeping rootstocks (1° high), very 

 leafy ; leaves rigid, lanceolate, distichous, becoming convolute ; panicle 

 loose (r-2'long); spikelets smooth, the upper glume and lower palea of 

 the staminate sterile flower strongly 7-nerved. — Sandy coast, Mobile {Mohr). 



P. agrostoides, Spreng. Very near some forms of P. auceps, but the 

 panicle more branched and contracted, tlie piu-plisli spikelets smaller, and 

 not clustered, and the uj)per glume 5-nerved. — Ditches, &c., Florida, and 

 northward. 



P. striatum, Lam Culms sparingly branched (2°-3^ high) ; leaves lan- 

 ceolate, with scabrous margins (G'-8' long) ; panicle somewhat corymbose, 

 consisting of several erect simple racemes ; spikelets oblong, acute ; the 

 upper glume and sterile palea strongly 7-nerved ; perfect flower rugulose. — 

 Banks of the Caloosa River, South Florida. 



P leucophseum, H.B K. Culms tall, branching; leaves broadly linear, 

 rough above, bearded at the throat (1° long) ; i)anicle contracted, racemose 

 (10'- 1-3' long), the simple branches erect ; spikelets scattered on one side of 

 the slender rachis, lanceolate, silky-pilose ; lower glume minute or wanting, 

 the upper one linear, 3-ncrved, shorter than the perfect flower; lower palea 

 of the neutral flower longer than the fertile one, 5-nerved. — Chuckolisky 

 Key, South Florida [Garbvi). 



P. maximum, Jaq. Culms (4°-5° high) smooth; leaves linear; panicle 

 very large, composed of long (6' -12') straight clustered branches ; spikelets 



