30 A Handbook of Nebraska Grasses. 
ARISTIDA. 
1. Awns twisted at the base into a spiral column.... 
PR ee eet at eet ag eS Aristida tubereulosa 
1, AWS NOt twisted al che wwaSeis = eee ee ye 
2, Central awn coiled sat the base-=. oo ee 
Ee eae ee a hs eet Aristida basiramea 
2. Central awn not coiled at the base: 222.2 ee 3 
3. First glume one-third the length of the second.... 
er name eC ee ee .. Aristida longiseta 
5. First glume about equaling the second........... 1 
Figure 44. 

FIG. PAGE 
44 80 
dt 80 
44. 80 
OL 

Aristida tuberculosa. fristida basiramea Aristida longiseta. 
