42 POALES 



3. Chaetochloa italica (L.) Scribn. Millet. 

 Cultivated for hay and often escapes. Anselmo; Lincoln. 



4. Chaetochloa verticillata (L.) Scribn. 



Found in several localities in the eastern part of the state, but not 

 common. Lincoln; Newark; Minden; Omaha; Orleans; Valentine; 

 Weeping Water. 



6. Cenchrus. 90. 



1. Cenchrus tribuloides L. Sand-bur Grass. 



A common and troublesome weed. Central City; Chelsea; Halsey; 

 Lincoln; Mullen; Talmage. 



Tribe 7. Agrostideae. 



Flowering scales hyaline or membranous, awnless or dorsally awned, 

 loosely enveloping the seed. 



Empty scales awnless or nearly so. 



Inflorescence an open panicle, or if spike-like the flowering scales 

 1 nerved. 

 Flowering scales with long hairs at the base. . 



Empty scales nearly equal; flowering scales dorsally awned. 



2. Calamagrostis. 

 Empty scales very unequal; flowering scales awnless. 



3. Calamagrostis. 

 Flowering scales not hairy at the base. 



Palet 2 nerved; stamens 3. 



Flowering scales shorter than the empty scales, and longer 



than the palet. 1. Agrostis. 



Flowering scales longer than the empty scales, and not 



longer than the palet. 5. Sporobolus. 



Palet 1 nerved or the 2 nerves close together, stamen only 1. 



4. Cinna. 

 Inflorescence spike-like. 



Flowering scales awnless; empty scales short awned. 6. Phleum. 

 Flowering scales awned; empty scales usually awnless. 



7. Alopecurus. 

 Empty scales with awns longer than the body of the scale. 



8. Polypogon. 

 Flowering scales indurated or membranous, closely enveloping the 

 seed, awned or awn-pointed at the tip. 

 Empty scales very small; rachilla produced beyond the flowers. 



9. Brachyelytrum. 

 Empty scales larger, generally as long as the flowering scales. 

 Flowering scales with a deciduous awn; empty scales broad. 

 Flowering scales glabrous. 10. Oryzopsis. 



Flowering scales densely pubescent with long hairs. 



11. Eriocoma. 

 Flowering scales with a permanent awn or the empty scales nar- 

 row. 

 Awn simple or wanting. 

 Awn not twisted, delicate or reduced to a mere point. 



12. Muhlenbergia. 

 Awn twisted and bent at the base. 13. Stipa. 



Awn three-branched, the lateral branches often small. 



14. Aristida. 



