SHOOTS. 



63 



Fig. 53. Woodbine (Ampelopris) in a deciduous forest. The tree trunks are almost 

 covered by the dense masses of woodbine, whose leaves are adjusted so as to form 

 compact mosaics. A lower stratum of vegetation is visible, composed of shrubs 

 and tall herbs, showing that the forest is somewhat open. — After Schimper. 



tudes or latitudes the subter- 

 ranean and prostrate types of 

 foliage-bearing stems are most 

 common ; and as one passes to 

 lower altitudes or latitudes the 

 erect stems become more nu- 

 merous and more lofty. Among 

 stems of the erect type the tree 

 is the most impressive, and it 

 has developed into a great vari- 

 ety of forms or ''habits." Any 

 one recognizes the great differ- 

 ence in the habits of the pine 

 and the elm (see Figs. 56, 

 57, 58, 59), and many of our 



Fig. 54. A portion of a woodbine 

 (Ampelopsu). The stem tendrils 

 have attached themselves to a 

 smooth wall by means of disk-like 

 suckers. — After Strasburger. 



