Family POACEZA 45 
3. Agropyron biflorum (Brignoli) R. & S. Purple Wheat-grass. 
In the foot-hills in the western part of the state. Box Butte county. 
4. Agropyron vaseyi S. & S. 
In the western part of the state. Chadron; Fort Robinson. 
5. Agropyron smithii Rydb. Western Wheat-grass. 
Common in prairies and meadows all over the state. Alliance; Bas- 
sett; Chadron; Halsey; Kearney; Lincoln; Minden; Neligh; Plummer 
Ford; Red Cloud; Thedford. 
6. Agropyron dasystachyum (Hook.) Vasey. 
In the western part of the state. Chadron; Glen. 
7. Agropyron repens (L.) Beauv. Couch or Quack Grass. 
In the northeastern part of the state. A specimen from Newcastle 
seems to belong here. 
8. Agropyron pseudorepens Scribn. & Sm. False Couch Grass. 
In moist soil and meadows throughout the state. Anselmo; Bel- 
mont; Callaway; Kearney; Minden; Thedford; Valley county. 
2. Lolium. 152. 
Empty scale shorter than the 8—20-flowered spikelet. 
Flowering scales 5-6 mm. long, awnless. 1. L. perenne. 
Flowering scales 7-8 mm. long, at least the upper awned. 
2. L. italicum. 
Empty scales longer than the 5-—7-flowered spikelets. 
3. L. temulentum. 
1. Lolium perenne L. Ray-grass. 
Introduced in various places but not common. Fort Robinson, Lin- 
coln; Valentine. 
2. Lolium italicum A. Br. Italian Ray-grass. 
Lolium multiflorum Lam. 
Lincoln. 
3. Lolium temulentum L. Bearded Darnel. 
Introduced but not common. 
3. Elymus. 156. 
Wild Rye-grasses 
Flowering scales awned, awn half as long as scale or more. 
Spikelets spreading; spikes mostly stout. 
Empty scales linear-lanceolate to linear. 
Empty scales short awned. 
Spike long exserted. 1. E. jejunus. 
Spike enclosed in the broad upper sheath. 2. E. virginicus. 
Empty scales usually long awned, or flowering scales hirsute. 
3. E. canadensis. 
Empty*scales awl-shaped, very narrow. 
Spikelets hirsute. © 4. E. striatus. 
_ Spikelets glabrous or nearly so. 5. E. arkansanus. 
Spikelets appressed, spikes narrow, slender. 
Flowering scales hispid. 6. E. vulpinus. 
Flowering scales glabrous. 
Spikelets few-flowered; awns of the flowering scales about as 
long as the scale. 7. E. macounii. 
