CHLORIDEAE 91 



3. Trisetum montanum Vasey. in the mountains of the 

 northern part ol the State at elevations of 7500 to 9000 feet in the 

 Transition Zone. 



40. A VENA L. Oats. 



Empty glumes shorter than the flowering 

 glumes; jianicle lax, ^somewhat nodding; 

 flowering glumes hairy'at the base. 1. .1. striata. 



Empty glumes longer than the flowering 

 glumes: i>anicle open: flowering glume of- 

 ten hairy up to the base of the awn. 2. A. fatua. 



1. Avena striata Mieh.x. in the northern part of the State in 

 the Tran.-^itioii Zone. 



2. Avena fatua L. Wild Oats. An introduced weed found in 

 grain fields in tlu' noitliein jiart of the State. Mostly in the Trans- 

 ition Zone. 



41. DANTHONIA D. C. Wild Oats Grasses. 



Flowering glumes pubescent only on the mar- 

 gin and at the base. 1. D. intermedia. 

 Flowering glumes hairy on the back as well as 

 on the margins. 

 Empty glumes 15 to 20 mm. long, 2. D. parryi. 

 Empty glumes 10 mm. long or less. 3. D. spicata. 



1. Danthonia intermedia Seribu. in the mountains in the 

 Transition Zone. 



2. Danthonia parryi Scribn. Collected once in the high 

 mountains at the north end of the State in the Canadian Zone. 



3. Danthonia spicata (L. ) Ueauv. A rare grass of the moun- 

 tains at tiie nortlicrn end of the State in the Transition Zone. 



The Grama Grasses and Their Relatives* (Tribe 

 VII, CiiLORiDEAi-: ) form a group that contains a number of 

 genera which are of great importance in the arid region 

 some of which ( tlie Grama Grasses and Buffalo Grass) are 

 the most widely distributed of any species in the West and of 

 more value economically than all the others put together. The 

 tribe also includes Bermuda Grass, the most extensively cul- 

 tivated species of any in all the arid region. Considering the 

 species in detail we have the following. 



See footnote, page 93 



