ON THE STRUCTURE OF BUDS 129 



brown. The outer scales represent stipules the leaf- 

 blades of which are not developed. 



The first pair are slightly unequal in length, and do 

 not overlap at any point nor surround the whole of the 

 bud. The second pair, when spread out, are almost semi- 

 orbicular, rounded at the apex, and slightly unequal 

 in length, the inner one being the longer and over- 

 lapped at the base by its fellow at both edges. They 

 cover a considerable portion of the bud, owing to 

 their width. The third pair are as long as the bud, 

 covering the whole of the younger members and over- 

 lapping at their edges. They are more membranous 

 than either of the one or two preceding pairs, and are 

 more or less covered with a viscid gum. They are 

 also slightly narrowed at the base. The fourth pair 

 are more decidedly boat-shaped than the previous 

 one, but are still imbricate. The first leaf generally 

 occurs in connection with the third or fourth pair of 

 stipules, but inside of, and covered by, them. It is 

 rhomboid, acute, shortly petiolate, serrate, thinly pube- 

 scent, glandular, viscid, and concave. The fifth pair 

 are somewhat smaller than the fourth, but otherwise 

 similar, as is their leaf. The latter is much more 

 involute in bud, though neither strictly convolute 

 nor conduplicate. Its form is doubtless due to the 

 abrupt arrest of the younger members of the bud; 

 for the fourth and fifth pairs of stipules, together 

 with the first and second leaf belonging to them re- 



K 



