44 P DALES 



Panicle over 6 cm. long. 1. s. longifolius. 



Panicle less than 6 cm. long. 2. S. vaginaeflorus. 



Spikelets not over 3 mm. long, panicle partly enclosed in the sheath. 



3. S. neglectus. 

 Panicle open, not spike-like. 



Spikelets over 4 mm. long, first scale subulate, often, awn-pointed. 



4. S. heterolepis. 

 Spikelets 2 mm. long or less. 

 Empty scales unequal, the first half as long as the second or less 

 First scale half as long as the second, not scabrous keeled. 



5. S. airoides. 

 First scale % as long as the second, scabrous keeled. 



6. S. cryptandrus. 

 Empty scales about equal. 



Rootstock present, leaves 2 mm. wide or more. 



7. S. asperifolius. 

 Rootstock wanting, leaves less than 2 mm. wide. 8. S. confusus. 



1. Sporobolus longifolius (Torr.) Wood. 

 Throughout the state. Kennedy; Lincoln; Valentine, 



2. Sorobolus vaginaeflorus (Torr.) Wood. 



Common in waste places except in the extreme west. Atkinson; 

 Bellevue; Cams; Hardy; Lancaster; Lincoln; Long Pine; Minden. 



3. Sporobolus neglectus Xash. 



Over most of the state. Callavvay; Long Pine; Valentine. 



4. Sporobolus heterolepis A. Gray. 



In the eastern part of the state, not common. Anselmo; Atkinson; 

 Ewing; Lincoln. 



5. Sporobolus airoides Torr. 



In prairies in the western part of the state. Alliance; Box Butte 

 County; North Platte; Sheridan County. 



6. Sporobolus cryptandrus (Torr.) A. Gray. 



Common in sandy soil all over the state. Anselmo; Box Butte Coun- 

 ty; Brunswick; (Cherry County; Culbertson; Republican; Scotts Bluff 

 County; Thedford; Valley County; Verdigris Creek. 



7. Sporobolus asperifolius Xees. & Meyen. 



In the western part of the state. Box Butte County; Hitchcock Coun- 

 ty; Kearney; Simeon; Rushville. 



8. Sporobolus confusus Vasey. 

 Scotts Bluff County. 



6. Phleum. 102. 

 1. Phleum pratensis L. Timothy. 



Cultivated for hay and often escapes. Long Pine; Lincoln; Sioux 

 County; Thedford; Valentine. 



7. Alopecurus. 102. 

 1. Alopecurus aristulatus Michx. Water Fox-tail. 



Alopecurus geniculatus L. 

 Common in wet places throughout the state. Box Butte County; Deuel 

 County; Halsey; Lincoln; Long Pine; Minden; Rushville; Scotts 

 Bluff County; Thedford. 



8. Polypogon. 107. . 

 1. Polypogon monspelienesis (L.) Deaf. Beard Grass. 



Newark. 



