(305) 



3. ELONGATA Hook. Gluuies longer than 

 the florets; panicle long and narrow, its rays 

 unequal, distant, mostly appressed. — U- San 

 Francisco. Summer. 



4. A. DANTHONOIDES Trin. Glumes longer 

 than the florets; panicle loose and open, the 

 lowermost rays in threes, the upper in pairs or 

 solitary. — U- Oakland. Summer. 



19. Arrhenatherum Beau v. 



Spikelets 3-flowered : lower S ; middle ^ ; 

 upj)er neutral. Glumes 2, concave, awnless; 

 the upper larger than the lower. Palets of S 

 flower 2; lower dorsally aristate near the base; 

 upper 2-carinate, awnless. Palets of ^ flower 

 2; lower dorsally aristate near the apex, upper 

 adnate to the caryopsis. — U- Leaves flattened. 

 Panicles with verticillate branches. Spikelets 

 pedicillate. 



1. A. AVENACEUM Beauv. — Common. Sum- 

 mer. 



European sj)ecies, x^i'obably introduced as a 

 fodder grass. 



20. HolcusL. 



Spikelets 2-flowered ; flowers pedicillate ; 

 lower d ; upper S . Glumes 2, navicular. 

 Palets of the ^ flower 2; lower navicular, awn- 

 less; upper 2-carinate. Ovary sessile, pyri- 

 form; caryopsis free. Palets of the S flower 

 2; upper 2-carinate ; lower aristate near the 



