MODIFICATIONS OF FORM 



20/ 



In many herbaceous plants the dorsiventral habit is more pronounced 

 than in trees. The whole shoot may take a creeping horizontal 

 position, or a climbing habit by lateral attachment, as in the Ivy. 

 The lopsidedness then becomes marked, and different degrees of it 



Fig. 139. 



Successive sympodial shoots of Carex. Each shoot is cf radial construction, but the 

 whole system is dorsiventral. (After Figuier.) 



may be noted. Thus in the creeping rhizome of Carex, while the 

 leaves show the l-3rd divergence, the axillary bud of some downward- 

 directed leaf, frequently the fourth, alone is developed. The apex of 

 the main shoot then turns upwards, while the axillary bud grows on, 

 continuing the false-axis (sympodium). Thus the individual shoot 



