KEY. 221 



0^3. Upper pale with the margins pectinately ciliate by 



stiff, distant hairs (and usually 2-toothed at the apex). . .624 



Upper pale more or less evidently ciliate on the 



nerves, or apparently naked 626 



6^4. Lower pale awned just from below the 2-cleft, or 



sharply 2-toothed apex 625 



Lower pale awned at the very tip of the 2-toothed, 

 or entire apex, 3-nerved. Stamens 2 or 3. The 1 -sided 

 spikes racemed. Xjeptochloa. 



Gr. IIL 23. 

 W. V. 53. 

 0^5. Lower pale either convex on the back, or compress- 

 ed-keeled, 5- to 9-nerved. Style or stigmas proceeding from 

 below the tip of the ovary, on its anterior face. Stamens 3. 

 Panicle simple or compound. Bromus. 



Gr. IV. 37. 

 W. IIL 30. 



Lower pale rounded on the back, about 7-nerved, 

 much longer than the upper one. Styles from the tip of the 

 ovary. A short-bearded tuft at the base of each flower. 



Avena striata, Mx. 

 (Trisetum purpurascens, Torr.) 

 Gr. YL 50. 

 W. 29. 



0^6. Flowers rounded on the back 627 



Flowers compressed-keeled on the back 634 



037. Flowers all equally developed, or nearly so. . . .628 



Spikelets oblong, or ovate-oblong, awnless, with 3 

 to 5 flowers, and only the 2 lower of them develoj^ed and 

 fertile, the rest imperfect, dissimilar, convolute around each 

 other. Lower glume almost equalling the spikelet. Lower 

 pale minutely scabrous on the nerves, blunt at the summit. 

 Panicle simple and sparingly branched. 



Melica mutica, Walt. 



Gr. IV. 30. 



W. IIL 38. 



6S8, Glumes both, or one of them shorter thar the low- 

 est flowers, or, if longer, at least shorter than the spikelet. 



629 



