POACEAE: CHLORIDEAE 37 



5. Hystrix. 158. 



1. Hystrix hystrix (L.) Millsp. 



Hystrix patula Moench. 

 In the eastern part of the state, not common. Cass County; Xehaw- 

 ka; Northeast Nebraska; Wahoo; Weeping Water. 



6. Hordium. 154. 



Empty scales 3-6 cm. long. 1. H. jubatum. 



Empty scales 2 cm. or less long. 2. H. pusillum. 



1. Hordium jubatum L. Squirrel-tail Grass. 

 A common weed all over the state. Alliance; Aten; Bassett; Halsey; 

 Hardy; Kearney; Kennedy; Lincoln; Minden; Nattick; Sioux County; 

 Thedford; Chadron. 



2. Hordium pusillum Nutt. 



Common throughout the state. Lincoln; Thedford. 



Tribe 3. Chlorideae. 

 Spikelets with several flowers, 1. Eleusine. 



Spikelets with one or rarely two perfect flowers. 

 Flowers perfect, spikes all alike. 

 Flowering scales 5 mm. or more long. 



Tall marsh grasses; flow^ering scales not 3-toothed. 2. Spartina. 

 Low grasses of dry prairies, flowering scales 3-toothed. 



Spikes 1-4. usually over 15 mm. long. 4. Bouteloua. 



Spikes numerous, 12 or more, less than 15 mm. long. 



5. Atheropogon. 

 Flowering scales 3 mm. long or less. 



Hydrophytes with broad spikes. 3. Beckmannia. 



Xerophytes with narrow, almost filiform spikes. 



6. Schedonnardus. 

 Flowers monoecious or dioecious, spikes very different. 7. Bulbilis. 



1. Eleusine. 124. 



1. Eleusine indica <L.) Gaertn. Crab-grass. 



Introduced but rare. Brunswick; Lincoln; Red Cloud. 



2. Spartina. 120. 



Spikelets over 10 mm. long, spikes over 5 cm. long. 



1. 8. cynosuroides. 

 Spikelets less than 10 mm. long, spikes less than 5 cm. long. 



2. S. gracilis. 



1. Spartina cynosuroides (L.) Willd. Slough Grass. 

 In wet places throughout the state, but most common in the eastern 

 part. Cherry County; Halsey; Laurel; Lincoln; Mullen; Niobrara 

 River; Saunders County; WTiitman; Valentine. 



2. Spartina gracilis Trin. 



In saline marshes in the western part of the state. Crawford; Chey- 

 enne County; Haigler; Sheridan; Simeon. 



3. Beckmannia. 123. 



1. Beckmannia erucaeformis (L.) Host. 



In wet places in the western part of the state. Anselmo; Bordeaux; 



Kennedy; Merriman; Whitman. 



