GRAMIXE.E. ((JRASS FAMILY.) 607 



48. BOUTELOUA, Lag. 



Spikelets crowded in two rows on one side of the flattened rachis of sin- 

 gle or racemose spikes, 1-3-flowered, the lower flower perfect, tlie upper 

 ones sterile or rudimentary, awned. Glumes keeled, the lower one shorter. 

 Flowering glume 3-nerved and 3-toothed ; the palet 2-nerved, 2-toothed. Sta- 

 mens 3. 



1. B. hirsuta, Lag. Annual; culms 1°-1|° high, filiform ; leaves very 

 narrow, papillose-ciliate ; spikes 1-2, many-flowered ; upper empty glume 

 papillose-hispid. Sterile flower longer than the floret. — South Florida 

 ( Garber). 



2. B. racemosa, Lag. Perennial; culms l"-'-3° high; leaves rigid, 

 glabrous ; spikes numerous, 4- 12-flowered ; upper empty glume scabrous on 

 the keel ; sterile flower shorter than the floret. — Bainbridge, Georgia (Feaij), 

 and westward. 



49. CHLOmS, Swartz. 



Chiefly tropical grasses, with compressed culms and sheaths, distichous flat 

 or folded obtuse leaves, and digitate rarely single spikes. Spikelets 2-.3- 

 flowered, imbricated or crowded in 2 rows on one side of the triangular rachis ; 

 the lowest flower perfect and sessile, tlie upper ones staminate or neutral, and 

 stalked. Empty glumes 2, membranaceous, persistent, the upper (exterior) 

 short-awned. Floret coriaceous, its glume boat-shaped, mucronate-awned 

 under the apex, the palet (mostly wanting in the sterile flowers) uuawned. 

 Stamens 3. Grain free. 



1. C. petrsea, Swartz. Culms (I°- 2° high) clustered, erect ; leaves glau- 

 cous; spikes 3 -.5; spikelets 2-flowered; glumes hispid, the upper oblong, 

 deeply emarginate ; flowering glume dark brown, hairy on the keel and mar- 

 gins, bearded at the base ; sterile flower neutral, club-shaped, awnless. — 

 Damp soil along the coa.st, Florida to North Carolina. May - August. ^ — 

 Leaves 3' -5' long. Spikes erect. Spikelets roundish. 



2. C. glauca, Vasey. Culms stout {S°-^° high), and, like the broad 

 (6" -8" wide) leaves, smooth and glaucous; spikes about twenty; spikelets 

 roundish, 2-flowered ; glumes hispid, the upper lanceolate, entire ; floret dark 

 brown, smooth ; upper flower obovate, short-awned. — Brackish mar.shes, 

 West Florida. August -Sept. (l) — Culms Y wide at the base. Leaves 

 H°-2°long. 



3. C. Floridana, Vasey. Culms .slender (2° high) ; leaves (2' -4' long) 

 glaucous; spikes single or by pairs; spikelets light brown, 3-flowered, the 

 middle flower staminate ; glumes smoothish, truncate, oblong ; flowering 

 glume of the perfect flower hairy on the keel and margins, distinctly awned; 

 sterile flowers obovate, smooth, the lower one short-awned. — Drv pine bar- 

 rens. Middle Florida. July- Sept. Jl — Spikelets larger than in the two 

 preceding. 



50. CYNODON, Richard. Bermuda Grass. 



Diffusely creeping perennial grasses, with short and erect flowering culms, 

 and flat leaves. Spikes digitate, 1-sided. Spikelets crowded, awnless, 2-flow- 



