608 GRAMINE^;. (GRASS FAMILY.) 



ered ; the lower flower perfect, the upper reduced to an awn-like pedicel. 

 Glumes 2, memhranaceous, nearly equal. Floret membrauaceous, its glume 

 large and boat-shaped. Stamens 3. Grain free. 



1. C. Dactylon, Pers. Spikes 3-5, filiform, purple; glumes rough- 

 keeled ; floret longer than the glumes, its glume hairy on the keel ; anthers 

 and stigmas purple. Waste places. Introduced. Flowering culms 6' - 12' 

 high. Leaves 2' - 4' long. Spikes 1'- 2' long, filiform, sterile. 



Var. maritimus, Nees. Culms stouter (6' high) ; leaves shorter and 

 broader, the sheaths imbricated; spikes 6-8, fruitful. Sandy coast, South 

 Florida. Leaves V long. 



51. CTENIUM, Panzer. 



Spikelets in two rows on one side of the rachis of the terminal solitary 

 spike. Glumes 7, the four lower and two upper ones sterile, the fifth fertile. 

 Lowest glume minute, second rigid, awued on the back, as long as the spike- 

 let, third, fourth, and fifth awned at the tip, sixth and seventh uuawned, neu- 

 tral. Stamens 3. Grain free. 



1. C. Americanum,Spreng. Culms 2-4 high, from strong perennial 

 roots, simple, tufted; leaves linear, scabrous and glaucous on the upper sur- 

 face; spikes 3' -4' long, mostly curved; spikelets spreading (not imbricated) ; 

 fertile glume densely ciliate. Damp pine barrens. August - Sept. 



52. ELEUSINE, Gsert. CROWFOOT GRASS. 



Annual creeping or spreading branching grasses, with flat leaves and digi- 

 tate rarely single spikes. Spikelets 2 - several flowered, crowded on one side 

 of the flattened rachis ; the uppermost flower imperfect. Glumes compressed- 

 keeled, membrauaceous, obtuse or pointed. Floret boat-shaped, pointed. Sta- 

 mens 3. Grain roundish, rugose, free. 



1. E. JEgyptiaca, Pers. Culms ascending from a creeping base ; leaves 

 fringed; spikes commonly 4, awn-pointed; spikelets 3 -4-flowered. Culti- 

 vated ground, common. Introduced. Culms numerous, 1 hio-h Spikes 

 1'- 2' long. 



2. E. Indica, Gaert. Culms (6' -18' high) flattened; leaves flat; spikes 

 2 -several, the lower ones sometimes scattered (2' -4' long) ; spikelets 6-flow- 

 ered. Cultivated ground, very common. Introduced. 



53. LEPTOOHLOA, P-e.mv. 



Spikelets sessile, loosely borne on one side of the filiform rachis of the long 

 branch-like racemose spikes, 3 - many-flowered. Glumes unequal, membra- 

 naceous, keeled, the flowering ones 3-nerved, rarely awned, longer than the 

 palea. Stamens 3. Grain oblong, free. 



1. L. mucronata, Kunth. Culms 2-3lnVh; sheaths of the broad 

 (4" -6" wide) rough leaves hairy; spikes very numerous, in an elongated rn- 

 ceme, 3' -6' long, spreading; spikelets small, 3 - 4-flowered ; glumes miicr... 

 nate, longer or shorter than the florets ; flowering glume obtuse or emarginate. 

 Cultivated fields. August -Sept. (l). 



