KEY. 223 



033. Lower pale rigidly coriaceous ; its nerves ter- 

 minating into a strong and abrupt awl-shaped tip. Stamens 

 2. Spikelets shining, 2-flowered. Panicle very simple and 

 slender ; its branches erect. 



Diarrhena Americana, Beauv. 

 {Diarrhena diandra^ Raf.) 

 Gr. IV. 26. 

 W. III. 35. 



Lower pale papery, not rostrate, 3- to 5-nerved, 



acute, pointed, or often bristly awned, rarely bluntish. L^p- 



per pale finely ciliate. Stamens mostly 3. Flowers rather 



dry and harsh. Festuca. 



Gr. IV. 36. 



W. III. 36. 



634. (626.) Glumes unequal-sided, one of them broader, 

 rounder, the other narrower, more flattened, or somewhat 



concave 635 



Glumes equal-sided. Tip of the flower straiglit. 



636 



63^. Pales awn-pointed, the points bent inward ; lower 

 one keeled and 5-nerved, with the nerves converging into 

 the tip ; keel rough- ciliate. Glumes keeled, awn-pointed, 

 with the tips bent inward, lower one broader and more con- 

 vex than the other, which is flattish or slightly concave. 

 Panicle 1 -sided, with glomerulate (3- or 4-flowered) spike- 

 lets. Sheaths compressed. Dactylis glomerata, L. 



Gr. IV. 27. 



W. IIL 33. 



Pales obtusish, or acute ; lower one oblong, com- 

 pressed-boat-shaped, papery, upper narrower, flattish, hya- 

 line. Glumes very dissimilar; lower one narrowly linear, 

 keeled, 1-nerved, upper broadly obovate, convex, 3-nerved, 

 scarious-margined. Spikelets commonly 2-flowered, with an 

 abortive rudiment or pedicel. Panicle loose, or contracted. 



£atonia. 



Gr. IV. 29. 



W. in. 37. 

 636. Spikelets compressed-2-edged (7- to 20-flowered). 

 Lower flowers, 1-3, neutral and 1-paled. Lower pale flat- 

 tened and wing-keeled, upper one double-wing-keeled. 



