graminea::. (grass family.) 585 



panicle simple, few-flowered ; spikelets smoothish, obovate, H ' long ; upper 

 glumes oval, three times the length of the lower one. — Low ground, Florida 

 to North Carolina, and westward. 



30. P. viscidum, Ell. Softly villous all over, except the branches of 

 the jianicle, and a narrow ring below each joint of the tall (3° -4° high) culm ; 

 leaves lanceolate, 6'- 10' long, sheaths viscid; panicle comp6und, lax-flow- 

 ered, 4'- 6' long ; spikelets ovate, 1" long ; upper glume strongly 9-nerved, the 

 lowest minute. (P. scoparium, Michx.) — Wet ground in the lower districts. 



31. P. depauperatum,Muhl. Culms low (2'- 12' high), simple, erect, 

 like the linear leaves ; panicle simple, few-flowered, with the branches erect, 

 often shorter than the subtending leaf ; spikelets oval-obovate (1" long), mostly 

 acute ; upper glume 9-uerved, smoothish, three times the length of the ovate 

 lower one. — Dry sandy soil in the upper districts. June. — Leaves rigid, 

 2' -6' long, smoothish or hairy. 



■^-^ ++ Spikelets less than I" long ; sterile flower neutral. 



32. P. seabriusculum, Ell. Culms smooth or slightly scabrous, 3° -4° 

 high; leaves linear-lanceolate, acuminate, 5'- 10' long, the sheaths more or 

 less pubescent; panicle smooth, diffuse, long-pedunded, 5' -6' long; spikelets 

 smooth, oblong, f" long, mostly purple ; upper glumes longer than the oblong 

 acute floret, the lower minute. — Wet banks of streams in the piue barrens 

 of the lower districts. 



33. P. microcarpon, Muhl. Glabrous ; culms strictly erect, 2° - 3° high ; 

 leaves thin, lanceolate, acuminate, cordate, 4' -6' long, tlie uppermost about 

 the length of the panicle ; panicle 4' - 6' long, the setaceous branches diver- 

 ging ; spikelets very numerous, oval, smooth, ^" long ; upper glumes as long 

 as the oval floret, the lower minute. — Rich shaded soil, chiefly in the upper 

 districts. 



34. P. Floridanum. Culms erect, I^° - 2° high ; leaves narrowly lanceo- 

 late, rigid, 2' -4' lung, the sheaths pubescent, the uppermost much shorter 

 than the oval panicle ; spikelets oval, f " long, almost villous ; upper glumes 

 as long as the floret, tlie lowest minute ; palet of the sterile flower minute 

 or wanting. (P. microcarpon, var., Vasei/. P. sphterocarpum, i^/(;;-«.) — In 

 and around shallow ponds, near the coast of West Florida. 



35. P. sphserocarpon, Ell. Culms 10'- 15' high, bearded at the 

 nodes ; lowest leaves oblong-ovate, short and crowded, the upper lanceolate, 

 cordate-clasping, 2' -4' long, with the base ciliate, scabrous above; panicle 

 oval, 2' -3' long, loosely many-flowered; spikelets oval or roundish, f" long, 

 minutely pubescent ; upper glumes thrice as long as the lowest ; floret oval, 

 obtuse. — Dry open woods, Florida to Tennessee. 



36. P. consanguineum, Kunth. Smooth or villous; culms 10'- 15' 

 high, soon excessively branching; leaves linear or linear-lanceolate, 2' -4' 

 long; panicle 2'- 3' long, often simple, loosely flowered ; spikelets oblong or 

 obovate, varying from i"-li" long; upper glumes strongly 7-nerved ; palet 

 of the sterile flower wanting. (P. villosum and P. angustifolium, Jill., the 

 smooth form. P. neuranthum, Griseb., a low form growing in dry sandy soil.) 

 — Damp shaded soil, common. 



