ON THE STRUCTUEE OF BUDS 105 



The ninth and tenth nodes bear leaves somewhat better 

 developed, but their stipules are smaller and narrower. 

 The fourth leaf, at the eleventh node of the bud,, is 

 conduplicate, and as long and about as wide as its 

 stipules, without being unfolded. Succeeding leaves 

 and stipules are very much smaller in the bud at this 

 stage, but otherwise similar to the fourth. 



It will be noted that the stipules become almost 

 separate from their leaf from the first one onwards, even 

 in the bud stage. The stipules are deciduous, falling 

 before the end of the summer. 



MAPLE (Acer) 



In species which have no stipules there is nothing 

 to distinguish the base of the leaf from the petiole. 



Thus, if we look at the winter-bud of a Sycamore, a 

 Maple (figs. 161, 162), or a Horse Chestnut, we find it 

 covered by a number of brown, leathery scales, which are, 

 like the leaves, opposite and decussate, so that one might 

 at first sight be disposed to regard them as a simple form 

 of leaf. On looking more closely, however, we shall 

 soon find one which shows a scar or three small teeth 

 at the summit. When the plant begins to grow in 

 spring some of the scales, especially on certain trees, 

 enlarge somewhat, and show small but often well- 

 developed leaf-blades at their tip. In the Norway Maple 

 (PI. II. figs. 2-4) these scales enlarge and assume a 



OF THE 



UNIVERSITY 



OF 



