38 



P DALES 



4. Bouteloua. 123. 



Rachilla of the rudimentary flower glabrous. 1, B. hirsuta. 



Racliilla of the rudimentary flower with a tuft of long hair at its apex. 



2. B. oligostachya. 



1. Bouteloua hirsuta Lag. 



In dry prairies over most of the state. Belmont; Gage County; Hal- 

 sey; Lincoln; Mullen; Pishelville; Valentine. 



2. Bouteloua oligostachya (Xutt.) Torr. Grama Grass. 

 Common on dry prairies throughout the state. Callaway; Central 

 City; Cherry County; Halsey; Hardy; Hat Creek Basin; Mullen; 

 Pishelville; Plummer Ford; Valentine. 



5. Atheropogon. 123. 

 1. Atheropogon curtipenlula (Michx.) Fourn, 



Common all over the state. Bazile Creek; Bellevue; Belmont; Frank- 

 lin; Hardy; Lincoln; Plummer Ford; Red Cloud; Louisville. 



6. Schedonnardus. 122. 



1. Schedonnardus paniculatus (Nutt.) Trelease. 



Common in dry places throughout the state. Beatrice; Brunswick; 

 Cushman; Grand Rapids; Halsey; Kearney; Lincoln; Minden; Ne- 

 braska City; Thedford; Valentine. 



7. Bulbilis. 125. 



1. Bulbilis dactyloides (Xutt.) Raf. Buffalo-grass. 



On dry prairies, mostly in the western part of the state. Alliance; 

 Belmont; Box Butte County; Central City; Franklin; Halsey; Lin- 

 coln; Minden; Norway; Plainview; Thedford; Valentine. 



Tribe 4. Aveneae. 



Awns dorsal, inserted below the teeth. 



Spikelets 2-6 flowered, the lower perfect. 1. Avena. 



Spikelets 2 flowered, the lower staminate. 2. Arrhenatherum. 



Awns attached between the teeth at the end of the scale. 



3. Danthonia. 

 1. Avena. 117. 

 1. Avena striata Michx, Purple Oats. 



In woods in the western part of the state. Long Pine; War Bonnet 

 Canon. 



2. Arrhenatherum. 118. 



1. Arrhenatherum elatius (L.) Beauv. Oat-grass. 



In flelds and waste places. Lincoln; Minden. 



3. Danthonia. 118. 



1. Danthonia spicata (L.) Beauv. Wild Oat-grass. 



Nebraska? 



Tribe 5. Phalarideae. 



1. Phalaris. 92. 



Panicle elongated, over 5 cm. long. 1. P. arundinacea. 



Panicle ovoid, less than 5 cm. long. 2. P. canariensis. 



