222 PRACTICAL BOTANY. 



Glumes large, as long as, or a little longer than the 

 flowers, which are enclosed by them. Lower pale 2-toothed, 

 oblong, or ovate, rounded-cylindraceous, 7- to 9-nerved, bear- 

 ing between the sharp-pointed teeth an awn, composed of the 

 3 middle nerves ; awn flattish and spirally twisted at the 

 base. Spikelets 7-flowered, appressed. Panicle simple, ra- 

 ceme-like, 2 inches long. Dajithouia spicata, Beauv. 



Gr. VI. 48. 



W. III. 27. 

 6^9. Spikelets ovate, sublanceolate, or linear 630 



Spikelets roundish, heart-shaped at the base. 

 Glumes convex. Flowers 2-rowed, imbricated, awnless. Pa- 

 nicle loose, erect ; branches s^ireading. S^^ikelets on delicate, 

 mostly drooping pedicels. Briza media, L. 



Gr. IV. 35. 



W. IV. 43. 



630. Axis of the spikelet bearded below each flower. 

 Lower pale 3-nerved, pointed, or short-awned 631 



Axis of the sj)ikelet not bearded below the flowers, 

 or the hairs belonging to the lower pale 632 



631. Upper pale apparently smooth ; lower one bearded 

 toward the base on the nerves, and with 3 cusps and 2 inter- 

 mediate short, obtuse, membranaceous teeth at the summit. 

 S])ikelets purple. Tricuspis seslerioides, Torr. 



Gr. IV. 24. 

 W. m. 31. 



Both pales conspicuously fringed ; the lower fur- 

 nished with 1 short awn and 2 cuspidate teeth. 



Uralepis purpurea, Nutt. 

 (Tricus2ns 2)U7'2n(7'ea, Gray.) 

 Gr. 24. 



w. m. 32. 



639. Spikelets always acute at the apex 633 



Spikelets obtuse at the apex, truncate (rarely slight- 

 ly acute), oblong, awnless, several- to many-flowered. Pales 

 membranaceous, lower one 5- to 7-nerved ; the nerves paral- 

 lel and separate. Stamens 3 or 2. Stigmas plumose, mostly 

 corajjound. Panicle racemose. Flowers mostly early decid- 

 uous. Glyceria. 



Gr. IV. 31. 



W. IV. 42. 



