1 ?2 



PLANT BIOLOGY 



some kinds of plants, with the remains of the old cleistog- 

 amous flower still adhering to the root. Cleistogamous 

 flowers usually appear after the showy flowers have 



Fig. 206. — Pods of Peanuts ripening underground. 



passed. They seem to insure a crop of seed by a 

 method that expends little of the plant's energy. The 

 pupil will be interested to work out the fruiting of the pea- 

 nut (Fig. 206). 

 Unbaked fresh 

 peanuts grow 

 readily and can 

 easily be raised 

 in the North in 

 a warm sandy 

 garden. 



Suggestions. — 

 152. Not all the 

 flowers produce 

 seeds. Note that 

 an apple tree may 

 bloom very full, 

 but that only rela- 

 tively few apples 

 may result (Fig. 207). More pollen is produced than is needed to 

 fertilize the flowers; this increases the chances that sufficient 



Fig. 207. — Struggle for Existence among the 

 Apple Flowers. 



