608 GRAMINE/E. (cKASS FAMILY.) 



ered ; tlie lower fii<wer perfect, the upper reduced to an awn-like pedicel 

 Glumes •>, nienil)riiiiiueous, nearly equal. Floret nienihranaieous, its glume 

 large and boat-shaped. Stameu.s 3. Grain free. 



1. C. Dactylon, I'ers. Spikes 3-5, Hlifurm, purple; glumes rough- 

 keeled ; (jorei lujij^fer than the glumes, its glunio iiairy on the keel; autliers 

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

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



Var. maritimus, Nees. Culms stouter (C liigh) ; leaves shorter and 

 broader, the slieatli.s imbricated; spikes 6-8, fruitful. — Sandy coast. South 

 Florida. — Leaves 1' long. 



51. CTENIUM, Panzer. 



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

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

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

 let, third, fourth, and rifth awned at the tip, sixth and seventh unawned, neu- 

 tral. Stamens 3. Grain free. 



1. C. Americanuni,Spreng. Culm8 2°-4°high,from strong perennial 

 roots, simple, tufted; leaves liuear, 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 Gkass. 



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 comjjressed- 

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

 mens 3. Grain roundish, rugose, free. 



1. E. iEgyptiaca, 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° high. Spikes 

 r-2' long. 



2. E. Indica, Gfcrt. 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. 



n I 53. LEPTOOHLOA, Beauv. 



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. StameTis 3. Grain oblong, free. 



1. L. mucronata, Kunth. Culms 20-3°high; sheaths of the broad 

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

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

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

 — Cultivated fields. August -Sept. (T). 



