HOW PLANTS ARE INFLUENCED 



335 



it goes on storing up food for several years, when it 

 blooms and uses up the nutriment stored in the leaves, 

 then dies. 

 Hence the 

 name, Century 

 Plant, due to 

 the popular 

 belief that it 

 blooms but 

 once in a cen- 

 tury. 



(8) More 

 abundant 

 woody fiber 

 (see Figs. 189 1 

 and 190) . 



(9) Longer palisade cells in the leaf (Fig. 194). 



(10) Reduction in number of stomata (Fig. 191) 

 and sinking of the stomata in wells and depressions 



(Oleander, Fig. 192). 



All plants 

 growing in dry 

 situations show 

 some of these 

 characteristics, 

 and mauy of 

 them can be 

 produced in 



Hairs of Mullein. 



190. Cross-section of stem of 

 Water-polygonum grown in 

 water; the fibrous bundles 

 and strengthening tissue 

 are shaded. 



180. Cross-section of stem of 

 Water-polygonum grown in 

 dry soil; the fibrous bundles 

 and strengthening tissue are 

 shaded. 



