52 Order POALES 
Tribe 7. AGROSTIDEZ. 
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. Calamovilfa. 
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, firmer than the empty scales, closely en- 
veloping the seed, awned or awn-pointed at the tip. 
Flowering scales with a deciduous awn; empty scales broad. 
Flowering scales glabrous. 9. Oryzopsis. 
Flowering scales densely pubescent with long hairs. 10. 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. 
11. Muhlenbergia. 
Awn twisted and bent at the base. _ 12. Stipa. 
Awn three-branched, the lateral branches often small. 
13. Aristida. 
1. Agrostis. 109. 
Palet conspicuous, at least 4% as long as the flowering scale. 
1. A. alba. 
Palet minute or wanting. 
Branches of the panicle spikelet-bearing to the base. 
2. A. asperifolia. 
Branches of the panicle naked below. 
Stems weak, often decumbent. 3. A. perennans. 
Stems erect. 4. A. hyemalis. 
1. Agrostis alba L. Red-top. 
Cultivated for hay and pasture. Common in low prairies where it 
often drives out the native grasses. Anselmo; Dukeville; Halsey; 
ear Creek basin; Kearney; Lincoln; Rushville; Talmage; Thedford; 
ahoo. 
