62 BUDS AND STIPULES 



At one place it raises itself more than elsewhere, 

 and develops two side processes the two primary leaf- 

 lobes. These soon develop two side lobes. In the 

 meanwhile the conjoined stipules gradually close over 

 the growing-point, and finally cover it entirely. They 

 do not, however, coalesce in the centre, but only touch. 

 At a later period the edges turn outwards and assume 

 a leaf-like form (fig. 136). 



The account given by Benjamin (10) is somewhat 

 different, but I believe that of Eichler, confirmed by 

 Mikosch, is substantially correct. 



POLYGONUM 



In Polygonum also the leaf arises as a small projec- 

 tion just below the growing-point, and gradually ex- 

 tends round it. 



This ring, which originates the primordial leaf, is 

 higher at one place, which will develop into the leaf-blade. 

 The rest of the ring grows and extends across the base 

 of the leaf until it entirely surrounds the growing-point, 

 forming the ocrea, and often projects some way beyond 

 the growing-point. It completely covers the bud, which, 

 however, eventually forces its way through. 



VERNATION 



The attitude of leaves in their very young stage is 

 termed by botanists ' vernation.' Some lie flat, as, for 



