The leaves are arranged alternately in two rows (2 ranked) 

 and when perfect consist of (1) a sheath with its margins over- 

 lapping or grown together surrounding the culm, (2) a blade, 

 and (3) a ligule, which is placed transversely at the inside of 

 the junction of the sheath and blade. 



A 



D. 



Fig. 2. —Forms of inflorescence. A. Oropetium capense, a portion of a 

 simple spike. B. Harpechloa capensis, a single se^und spike. 0. Eleusine indica,. 

 secund spikes. D. Setaria perennis, a panicle (false spike). E Andropogon 

 hirtus, a single pair of racemes from the panicle. F. Sporobolus festivus, var. 

 stuppeus. A portion of the panicle (A. magnified, the others slightly reduced). 



The inflorescence consists of (1) a spike if the spikelets 

 are not stalked (sessile), or (2) a raceme if the spikelets (or- 



