80 



BUDS AND STIPULES 



is eventually pushed off. Intrapetiolar buds also occur 

 in Skimmia jajwnica, XantJtoxylon Bungei, &c. 



It will be observed that the leaf-stalk does not detach 

 itself, as in the Plane, at the base, but a little higher up, 

 thus leaving a sort of cap, which for clearness is repre- 

 sented in the figure as a little detached, but which in 

 nature fits closely over the bud, and remains till spring, 

 when it is pushed off by the expanding leaves. The 



Fig. 121. 



I'm. 122. 

 Philadelphia coroxarius. 



Pre. 121. Small piece of shoot. Fig. 122 Portion of fig. 121 much enlarged ; 

 a a, line along which the leaf detaches itself. 



cavity is also lined by a thick felt of brown, hollow, 

 air-containing hairs, which no doubt serve as a very 

 effective non-conductor of heat. If the brown cap is 

 removed the green bud will be found snugly ensconced 

 under it. 



The bud in the Robinia, like that of Philadelphus, 

 is completely covered by the base of the petiole. 



If we examine the scar left by the leaf, we shall 

 find, as pointed out by Benjamin, a broad, irregular, 



