44 Order POALES 
Alliance; Halsey; Lincoln; Newark; Niobrara; North Platte; Plum- 
mer Ford; Valentine; Whitman. 
20. Munroa. 125. 
1. Munroa squarrosa (Nutt.) Torr. False Buffalo-grass. 
A common ruderal in sand-hills and shortgrass region. Belmont; 
Callaway; Crawford; Thedford; Valentine. 
Tribe 2. HORDEZ. 
With 1 spikelet at each joint of the rachis. 
Spikelets with their sides turned toward the rachis. 1. Agropyron. 
Spikelets with their edges turned toward the rachis. 2. Lolium. 
With 2 to several spikelets at each joint of the rachis. 
Spikelets 2—many-flowered. 
Empty scales present forming an involucre around the cluster of 
spikelets. 
Rachis of the spike not readily breaking into joints, empty 
scales awnless or straight awned. 3. Elymus. 
Rachis readily breaking into joints, empty scales with long 
bent awns. 4. Sitanion. 
Empty scales wanting or rudimentary. 5. Hystrix. 
Spikelets with but 1 fertile flower, lateral spikelets often rudi- 
mentary and sterile. 6. Hordeum. 
1. Agropyron. 153. 
No horizontal rootstocks or stclons; stems tufted. 
Awns erect or none; spikelets nearly terete, approximate on the 
axis. 
Awns usually as long as the scales; spikes nodding, about 5 mm. 
wide. 1. A. caninum. 
Awns short or none. 
Spikes slender and lax, 7-20 cm. long, green. 2. A. tenerum. 
Spikes stout and dense, 3-8 cm. long, usually purplish. 
3. A. biflorum. 
Awns spreading, spikelets flattened, remote on the rachis, empty 
scales awnless. 4, A. vaseyi. 
With horizontal rootstocks or stolons. 
Spikelets spreading, much flattened, 7-13-flowered. 5. A. smithii. 
Spikelets erect, slightly if at all flattened. 
Flowering scales densely pubescent, spikelets 5—9-flowered. 
6. A. dasystachyum. 
Flowering scales glabrous, 3—7-flowered. 
Under surface of leaves smooth, empty scales smooth. 
7. A. repens. 
Under surface of leaves rough, empty scales hispidulous. 
8. A. pseudorepens. 
1. Agropyron caninum (L.) R. & S. Awned Wheat-grass. 
In the western part of the state. Lincoln; Newark; O’Neill; Thed- 
ford; Valentine; Whitman. 
2. Agropyron tenerum Vasey. Slender Wheat-grass. 
Common in the western part of the state. Belmont; Crawford; 
Dismal river; Hat Creek basin; Kearney; Halsey; Newark; New- 
port; North Platte; Valentine. 
