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ZONES AND REGIONS 



[Pt. Ill, Sect. I 



vi. CAULIFLORY IN THE RAIN-FOREST. 



In temperate zones flowers appear mostly on the current year's twigs, 

 more rarely on those of the preceding year, but only in a few species, such 

 as Cercis siliquastrum, on older branches or stems ; whereas in constantly 

 humid tropical forests caiiliflory, that is to say the formation of flowers 



Fig. 17S. Heliconia Bihai. Boal-liko bracts containing water. 

 Half the natuval size. From Flora Brasiliensis. 



Fig. 179. Mendozia Vel- 

 loziana. Flower-buds surround- 

 ed by a pair of adherent bracts 

 filled with mucilaginous liquid. 

 Blumenau, .South Brazil. 



Fig. I So. Clerodcndron Mina- 

 hassae. Water-holding caly.M 

 of a fruit. Natural size. Aftei 

 Koorders. 



on old wood, is not rare. It is occasioned by the fact that dormant 

 axillary buds become further developed after Several or many years, and: 

 breaking through the cortex, freely expand their flowers (Figs. iSi 

 and 182). 



In cauliflory the flowers appear sometimes only on main stems, some 

 times only on branches, sometimes, and this is most usual, on both maiir 



