HIGHER PLANTS 



Fig. 71. — Pickerel-weed, Pontederia cordata, flow- 

 er spike. 



Occurrence. — Common along stream sides and in pond 

 shallows. Blooms June-October. Generally distributed 

 through the eastern states, westward to Minnesota, and 

 southward to Florida. 



Animal associates. — Pickerel-weeds are insect-pollinated; 

 their blue anthers being so placed that an insect cannot enter 



87 



