330 PRAGTIGAL BOTANY. 



61 8. Lower pale in the perfect flower ■bristle-pointed from 

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

 awn from below its middle. 



A.rrhenatherum avenacsum, Beanv. 

 {Avena elatiot^ L.) 

 Gr. VI. 51. 

 W. 28, § 1. 

 Flowers not at all awned. (601) Panioum. 



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



620 



Flowei-s awnless, or awned at, or from a little 



below the tip .V..623 



630. Awn of the lower pale from 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 on the back and eroded or denticu- 

 late at the truncate apex. Awn either barely equalling the 

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



(Airaflexuosa et A. caespitosa, 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 atropurpurea, Wahl, 



Gr. 47. 

 W. 26. 

 Pale with the apex 2-toothed. Awn bent 628 



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

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



§ Airopsis. 

 {Avena proBeox, Beauv.) 

 Gr. 60. 

 W. HI. 28. 



Pale compressed-keeled. Awn from a little above 

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

 linear, much contracted, dense. Trisetlim. 



Gr. VI. 49. 



W. III. 29. 



