geaminejE. (grass family.) 583 



Smaller (2°-4° high) ; leaves and shoaths smooth ; panicle (6'- 1 2' long) oblong ; 

 awns short and twisted. — Var. ERKViBARBia. (E. brevibarbis, Michx.) Smooth 

 or nearly so; rachis of the oblong panicle rough (not woolly) ; hairs of the in- 

 volacre shorter than the glumes. — Dry or wet soil, Florida to North Carolina, 

 Sept. and Oct. 



2. E. strictUS, Baldw. Culms, leaves, and sheaths smooth or slightly 

 roughened; panicle (10'-15' long) spiked; involucre very short or none; 

 glumes rough ; awns straight. — River-banks, Florida and the lower districts of 

 Georgia, and westward. Sept. — Culms 4° -8° high. Leaves 3" -6" wide. 

 Spikelets twice the sizie of the preceding. 



58. SORGHUM, Pers. 



Spikelets 2-3 together on the slender branches of the loose panicle ; the lat- 

 eral ones sterile or a mere pedicel ; the middle or terminal one fertile. Glumes 

 coriaceous or indurated, closely bearded, sometimes awnless. Otherwise like 

 Andropogon. 



1. S. avenaceum. Panicle erect; glumes yellowish, lanceolate, the 

 lower one hairy; one palea to each flower, linear, ciliate ; awn rough, slender, 

 twice as long as the glumes ; sterile flowers reduced to one or two slender hairy 

 pedicels. (Andropogon avenaceus, Michx. A ciliatus, EH.) — Dry sandy soil, 

 Florida to North Carolina. Sept. U — Culms (2° - 4° high) and leaves smooth. 

 Panicle oblong, 6' - 12' long. 



2. S. nutans, Gray. Panicle long and narrow, nodding ; glumes dark 

 brown, the upper sparingly, the lower densely hairy ; palese of the upper flower 

 2, unequal ; awn 4 times the length of the glumes, bent in the middle, rough 

 above, twisted and hairy below ; sterile spikelets mostly rudiments. (A. nutans, 

 X,) _ Dry barren soil, Florida and northward. Sept. IJ. — Culms 2° - 4° high. 

 Panicle 10-2° long. 



3. S. secundum. Panicle erect, contracted, 1 -sided; spikelets nodding; 

 glumes light brown, very hairy all over ; otherwise like the last, and probably a 

 variety of it. (Andropogon secundu.s, Ell.) — Dry sand-ridges in the pine bar- 

 rens, Georgia and Florida. Sept. and Oct. — Culms 2° - 3° high. 



S. vuLGARE, Pers., is the Doera Corn ; S saccharatom, the Broom 

 Corn ; S. cernuum, Willd., the Gdinea Porn. S. halapensb, Pers., is 

 sometimes cultivated under the name of Cuba Grass. 



69. LUZIOLA, Juss. 



Perennial aquatic or marsh grasses, with narrow elongated leaves, and pan- 

 icled monoecious flowers ; the pistillate and smaller staminate spikelets borne 

 on separate panicles. — Spikelets scattered, on jointed pedicels, nearly terete, 

 1-flowered. Glumes none. Palese 2, nearly equal, membranaceous, concave, 

 obtuse, strongly nerved. Squamulte 2. Stamens 5-11: anthers linear, 2-lobed 

 at the base, much longer than the short filaments. Styles 2, short : stigmas 

 plumose. Grain free, ovoid. Pericarp crustaceous. 



