CHAPTER VI. 

 THE TRIBES AND THEIR GENERA. 



AGROSTIDE^. 



Panicles. 



Florets hairy at base ; leaves rough. 

 Hairs few and short. Agrostis, 26-29. 

 Hairs numerous, long and silky. Calamagrostts, 32-35. 



Florets not hairy at base ; leaves smooth and broad. Milium, 2. 

 Spikes. 



vSpikelets alternate in two opposite rows. Mibora, 22, 

 Spike ovoid, almost globular. Lagurus, 23, 

 Spike tapering from base. 



Spikelets compressed. Polypogon, 24, 25. 

 Spikelets not compressed. Gastridium, 30. 

 Spike fusiform or cylindrical. 



Ligule lengthy and bifid. Psamma, 31. 

 Ligule not lengthy and bifid. 

 Spike bristly. Phlewn, 13-17 '. 

 Spike silky. Alopecurus, 

 18-21. 



Milium. Spikelets cylindrical, 

 stalked, awnless. Glumes two, nearly 

 equal, membranous, enclosing floret, 

 tumid, ovate, pointed. Outer palea 

 smaller, ovate, convex, permanent, 

 finally indurated, enclosing the seed. 

 Lodicules two, ovate, obtuse ; sta- 

 mens three, filiform, short, ovary 

 roundish; styles two ; stigmas tufted. 



43 



Milium effusion. 

 Floret. For Spikelet see p. 114. 



