582 GRAMINE.E. (GRASS FAMILY.) 



6. P. Curtisii, Chapm. Panicle slender, spike-like (6' -8' long), the ap- 

 pressed lower branches remote ; spikelets ovate-lanceolate ; glumes slightlv 

 keeled, the upper 5-nerved, twice as long as the lower one, and rather shorter 

 than the acutish floret; sterile flower 3-androus; culms and smooth linear- 

 lanceolate leaves rigid ; sheaths smooth or hairy. Ponds and swamps, 

 Florida to North Carolina. Culms 3 -4 high, often rooting at the lower 

 joints. 



7. P. prostratum, L. Culm creeping, l-2long; leaves 1'- 2' long, 

 ovate-lanceolate, ciliate and clasping at the base ; panicle short, composed of 

 5-9 short closely-flowered branches ; spikelets less than I" long, ovate, acute ; 

 glumes longer than the mucrouate floret. Low ground, Mobile and New 

 Orleans. 



8. P. paspaloides, Pers. Culms 2-3 high from a creeping base; 

 leaves narrow, 6' - 1 0' long; panicle narrow, the numerous branches 1' or 

 less long, appressed ; spikelets in 2 rows ; lowest glume truncate, the others 

 as long as the floret. South Florida. 



9. P. fuscum, Swartz. Culms l-2 high, branching; leaves linear, 

 3" -5" wide; panicle 4' -5' long, the branches scattered, single, erect; spike- 

 lets obovate, acute ; glumes reticulate, as long as the finely rugulose floret. 

 South Florida, and westward. 



Var. fasciculatum, Griseb. Culms stouter, 2 -3 high; leaves larger, 

 6" -8" wide; branches of the panicle more numerous and crowded, the lower 

 clustered. South Florida. 



10. P. leucophseum, HBK. Culms tall, branching; leaves broadly 

 linear, bearded at the throat (1 long) ; panicle contracted, racemose ( 10'- 15' 

 long), the branches erect ; spikelets scattered on the slender rachis, lanceolate, 

 silky-pilose ; lower glume minute or wanting, the second linear, 3 nerved, 

 shorter than the floret; the third longer, 5-nerved. South Florida (Gurber). 



* * Panicle compound, the spikelets racemose along its ultimate slender branches, 

 singly, or in cluster-like racemes, longer than their pedicels. 



*- Root annual. 



11. P. sparsiflorum, Vasey. Culms weak, diffusely branched ; leaves 

 linear; panicle simple, the few elongated scattered branches bearing 2-4 ob- 

 long-obovate acute spikelets near the summit; glumes papillose-hispid, the 

 second one 5-nerved, longer than the pointed granular-roughened floret ; the 

 lower minute, obtuse. (P. angustifolium, Flora.) Mississippi? and west- 

 ward. Culms 1- 2 long. Spikelets 1 J" long. 



12. P. verrucosum, Muhl. Glabrous; culms very slender, 1- 4 long, 

 branching; leaves linear, 3' - 6' long ; panicles diffusely branching ; spikelets 

 scattered on the ultimate setaceous branches, |" long ; glumes roughened with 

 fine warts, the lowest minute. Wet ground, North Carolina, and westward. 



13. P. proliferum, Lam. Glabrous ; culms thick and succulent, as- 

 cending, geniculate, l-3 high; leaves broadly linear, - 2 long; panicles 

 lateral and terminal, at length diffuse ; spikelets approximate along the se- 

 taceous branches, oblong, acute; glumes longer than the acute floret, the 

 lowest broad and clasping. (P. geniculatum, Ell., a large form, 3-p high, 



