28 BUDS AND STIPULES 



Others, as, for instance, those of the Pea, Pansy, 

 Bedstraw, &c., which assist in performing the ordinary 

 function of leaves, live as long as, and drop with, the 

 leaves to which they belong. 



Lastly, there are some, though they are exceptional, 

 which survive the rest of the leaf and protect the next 

 succeeding bud, as, for instance, in Petteria (figs. 35, 

 36) ; or they may last indefinitely, as in Robinia. 



FIG. 33. ROBINIA VISCOSA. Nat. FIG. 34. ROBINIA PSEUDACACIA, 



size. VAR. DECAISNEANA. Nat. size. 



s, s, spiny stipules sketched in winter s, s, spiny stipules sketched in winter 



(Jan. 25, 1897) ; sc, scar of fallen (March 13, 1897) ; te, scar of fallen 



leaf ; g, gland above the bud. leaf ; g, gland above the bud. 



In certain cases most of the stipules of a species are 

 caducous, while some of them are persistent. 



Thus, in the Black Poplar (Populus nigra), (fig. 37) 

 the stipules of the upper leaf often survive the leaf- 

 blade, which drops off in autumn, while they retain 

 their place and protect the young bud through the 

 winter. 



