MORPHOLOGY OF ANGIOSPERMS. 



lOI 



We have to distinguish between overground shoots and under- 

 ground shoots. The former are sometimes designated as epi- 

 geous (upon the earth) and the latter as hypogeous (under the 

 earth). 



Epigeous Shoots. — As would be supposed these two kinds 

 of shoots vary to a certain extent. In epigeous shoots a number 



Fig. 65. A, woody vine of Canada moonseed (Mc«ijper»KH« <ra«adeMje) which ascends 

 Ijy twining to the right; B, young tulip poplar (Liriodendron tuUpifera). 



of features may be noted. If the internodes are long the leaves 

 do not usually interfere with one another so far as exposure to 

 light is concerned, but if the internodes are short, the leaves are 

 all brought close together on the axis, and hence were it not for 

 various modifications, their relation to light would be very 

 unequal. Sometimes the shoot-axis may share with the leaves 



