BUDS 



23 



Vernation is the term applied to denote the manner in which 

 each single leaf is packed in the bud. Each leaf may be flat or 

 plane (figs. 29, 32). In some cases the leaf is ^/i&^ in various 

 ways along the courses of the chief veins. The two halves of 

 the lamina maybe simplyy»/(/i?^together along the mid-rib, like 

 two pages of a book 

 (figs. 30, 33); or 

 there may be a 

 number of folds 

 (fig- 34) along 

 several of the large 

 veins, especially in 

 leaves with parallel 

 venation {e.g. many 

 grasses) and with 

 palmate venation, 

 so that the young 

 leaf reminds us of 

 a closed fan or a 



pleated garment. - - ^j^jtipuies. 



In other mstances 

 the leaf is rolled from side to side. Each half of the lamina 

 may be rolled towards the middle line of the upper face of the 

 leaf, as in the Pear (figs. 31, 35, 38), or towards the middle line 

 of the lower face (fig. 36). Occasionally the whole lamina is 

 rolled sideways in one direction (fig. 37). Finally, the leaf 

 may be coiled from the apex of the leaf towards the base, like a 

 watch-spring. 



Fig. 38.- 



-UryrolHng of leaves (3i, 



. ^3i ^4) of bud of Pear. 

 (After JDennert.) 



