298 



PHARMACEUTICAL BOTANY 



Flowers trimerous (having the parts of each whorl in threes or 

 multiple thereof). 



Secondary growth in roots generally absent. 

 Medullary rays generally absent. 



PIG. 164. Pistillate and staminate inflorescences of corn (Zea mays). 



(Robbins.) 



I. Order Graminales. Graminea or Grass Family. Mostly 

 herbs with cylindric, hollow jointed stems whose nodes are swollen. 

 The leaves are alternate, with long split sheaths and a ligule. Flow- 



