2l6 



ZONES AND REGIONS [Pt. Ill, Sect. I 



drawn, namely, that certain tropical plants exceed all known temperate 

 plants in rapidity of growth. 



Fig. 113. Dendrocalamus gigantens in the botanic garden at Peradeniya in Ceylon. 

 From a photograph. 



Certain bamboos must be numbered among the representatives of the 

 vegetable kingdom that grow most rapidly. Wallich mentions that 

 a shoot of Bambusa arundinacea increased in length about 7 meters 



