EOW 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 



188. Hairs of Mullein. 



once m a cen- 

 tury. 



(8) More 

 abundant 

 woody fiber 

 (see Figs. 189' 

 and 190) . 



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



(10) Eeduction 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 many of 

 them can be 

 produced in 



1 0. Cross-section of stem of 

 W.'iter-polygonum grown in 

 dry soil; tlie fibrous bundles 

 and strengthening tissue are 

 sliaded. 



190. Cross-section of stem of 

 Water-polygonum grown in 

 water: the fibrous bundles 

 aud strengthening tissue 

 are shaded. 



