213 PliACTTGAL BOTANY. 



582. Awn deeply 3 -parted (or 3 awns). Panicle con- 

 tracted or racemose. Aristida. 



Gr. II. 15. 

 \V. I. 12. 

 Awn not 3-parted 583 



583. Aw^n twisted, very long, from the apex, stout be- 

 low. Lower pale coriaceous, cylindrical-involute, closely em- 

 bracing the smaller, upper one, and the cylindric grain. 

 Flow^er with a conspicuous, obconical, bearded stalk (callus). 

 Panicle loose, or somewhat contracted. Stipa. 



Gr. 11. 14. 

 W. 1.13. 

 Awn not twisted 584 



584. Lower pale awned at the apex 586 



Lower pale awned at the back 585 



585. Flower stalked in the keeled glumes. Pales 

 lanceolate, pointed. Stamen only 1. Panicle large, com- 

 pound, terminal. Cinna arundinacea, L. 



Gr. XL 9. 

 W. L 6. 



Flowers sessile in the glumes. Pales pointless; 

 upper one minute, or obsolete. (569) Agrostls (591). 



Gr. I. 7. 

 W. I. 4. 



586. Conspicuous squamulse 2 or 3. Flow^erwith a very 

 short callus. Low^er pale coriaceous, at length involute ; its 

 awn deciduous. Spikelets nearly terete. Styles short, or 

 united below^ Panicle various, simple and raceme-like, spar- 

 ingly branched, or finally contracted, with the branches 

 usually in pairs. Oryzopsis. 



Gr. IL 13. 

 W. II. 14. 



Conspicuous squamulse none. Panicle mostly con- 

 tracted 587 



587. Glumes minute, the lower one scarcely perceptible. 

 Pales rough, with scattered, short bristles ; lower one 5-nerved 

 and contracted at the apex into a stout, long, straight, smooth 



