,")S2 OKAMIXK.E. ((;KASS FAMILY.) 



<■>. P. Curtisii, Cliaimi. r:iiii<lc slender, spikc-liki' (C'-8' loiig),tlie ap- 

 pressed lowiT ItraiR-lu'S reiiioto ; s|)ikclets ovate-lameolate ; gliiiiies slightly 

 keeled, the u|i|ier 5-uervod, twice as lung as the lower one, and rather shorter 

 than the aciitish Horet ; sterile flower .3-androus; culms and siiiouth linear- 

 lauceolate leaves rigiil ; 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.. Cnlm creeping, 1*^-2^ long; leaves r-2'long, 

 ovate-lanceolate, ciliate and clas])ing at the base ; panicle sliort, composed of 

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

 glumes longer tlian the niiicrnnate Horet. — Low gidnnd, M(jbile and New 

 Orleans. 



8. P. paspaloides, I'ers. Culms 2°-3° high from a creeping ba.se; 

 leaves narrow, C- 10' long; jianide narrow, the numerou.s brandies )' or 

 less long, a]ipressed ; spikelets in 2 rows; lowest glume truncate, the others 

 as long as tlie H(jret. — South Florida. 



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

 3" -5" wide; panicle 4'-.')' long, the branches scattered, single, erect ; sj)ike- 

 Icts obovate, acute ; glumes reticulate, as long as the finely riigulose 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, IIBK. Culms tall, brandling; leaves l)roadly 

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

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

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

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



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



siiiqlij, or in cluster-like racemes, longer than tin ir jxilicels. 



■*- Root annual. 



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

 linear ; panicle simple, the fonv 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-rongliened floret; the 

 lower minute, obtuse. (P. angustifolium, Flora.) — Missis.sippi ? and west- 

 ward. — Culms 1°- 2^ long. Spikelets 1^" long. 



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

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

 scattered on the ultimate setaceous liranches, i" 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°-G° high. 



