666 GEAMINE^. 



P. CODJUgatum, Berg. Smooth and branching (2° long) ; leaves thin, 

 linear ; spiljes 2-3, flat, the two terminal ones conjugate ; spilselets minute, 

 in two rows, ovate, long-fringed. — New Orleans {Dr. Hate). Introduced. 



P. dilatatum, Poir. Culms stout (3° -4° high) ; leaves flat, linear-lan- 

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

 villous, much wider than the flat racliis ; glumes and sterile palea 5-nerved, 

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

 westward. 



PANICUM, L. 



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

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

 tate ; spikelets minute ; glume half as long as the paleae. (Digitaria villosa, 

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



P. prostratum, L. Creeping, branching; leaves short {V -2' long), 

 ovate-lanceolate, eiliate; panicle short, composed of 6-10 simple racemes; 

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

 of the triandrous sterile flower 5nerved. (P. Aurelianum, Hale.) — Mobile 

 and New Orleans. 



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

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

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

 Florida (Blodgett, Garber). 



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

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

 loose (l'-2'Iong); 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. anceps, but the 

 panicle more branched and contracted, the purplish spikelets smaller, and 

 not clustered, and the upper glume 5-nerved. — Ditches, &e., Florida, and 

 northward. 



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

 ceolate, with scabrous margins (6' -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. leueophseum, H.B K. Culms tall, branching; leaves broadly linear, 

 rough above, bearded at the throat (l°long); panicle contracted, racemose 

 (10'- 16' long), the simple branches erect ; spikelets scattered on one side of 

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

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

 of the neutral flower longer than the fertile one, 6-nerved. — Chuckolisky 

 Key, South Florida (Garber). 



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

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



