230 PRACTICAL BOTANY. 



618. Lower pale in the pei-fect flower bristle-pointed from 

 near the tip, in the staminate furnished with a long, kneed 

 awn from below its middle. 



Arrhenathsrum avenaceum, Beauv. 

 [Avena elatior, L.) 

 Gr. VI. 51. 

 W. 28, § 1. 

 Flowers not at all awned. (601) Panicum. 



0t9. (613.) Flowers awned on the back, or from the base. 



G20 



Flowers awnless, or awned at, or from a little 

 below the tip 623 



090. Awn of the lower pale &*om about the middle of 



its back. Spikelet 2- to 3-flowered 621 



Awn from near the base of the membranaceous pale, 

 which is 3- to 5-nerved ow the back and eroded or denticu- 

 late at the truncate apex. Awn either barely equalling the 

 pale, or twice its length. § Deschampsia, Beauv. 



{Alra flexuosa et A. coisjntosa, L.) 

 Gr. VI. 47. 

 W. III. 26. 



631. Pale with the apex truncate and entire, or nearly 

 so. Awn borne at or above the middle, stout, twice the 

 length of the pale. Aira atropxirpurea, Wahl. 



Gr. 47. 



W. 26. 



Pale with the apex 2 -toothed. Awn bent 622 



633. Pale rounded on the back and obscurely 3- to 5- 

 nerved. Awn from the middle, or a little below it. 



§ Airopsis. 

 (Avena p7'cecoXy Beauv.) 

 Gr. 50. 

 W. III. 28. 



Pale compressed-keeled. Awn from a little above 

 the middle. Panicle long, narrow, loose, or oblong to 

 linear, much contracted, dense. Trisetum. 



Gr. VI. 49. 



W. III. 29. 



