GRAMIXEJE. (GRASS 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, the upper 

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

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

 mens 3. 



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

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

 papillose-hispid. Sterile flower longer thau 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. Baiubridge, Georgia (Feay), 

 and westward. 



49. CHLORIS, 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 racliis ; 

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

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

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

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

 Stamens 3. Grain free. 



1. C. petrsea, Swartz. Culms (1 - 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, awuless. 

 Damp soil along the coast, Florida to North Carolina. May- August. 2/ 

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



2. C. glauca, Vasey. Culms stout (3 -5 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 marshes, 

 West Florida. August - Sept. @ Culms \' wide at the base. Leaves 

 l|-2long. 



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. Dry pine bar- 

 rens, Middle Florida. July -Sept. ^ 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- 



