84 



FORMS OP STIPULES. 



other at the same height on the stem, it occasionally happens that the 

 stipules at either side unite wholly or partially, so as to form an inter- 

 petiolary or interfoliar (inter, between) stipule, as in Cinchona (fig. 



190 s). In the case of alternate leaves, the stipules at the base of 

 each leaf are sometimes united to the petiole and to each other, so as 

 to form an adnate, adherent, or petioldry stipule, as in the Rose (fig. 



191 s), or an axillary stipule, as in Houttuynia cordata (fig. 192 s}. 



190 



In other instances, the stipules unite together on the side of the stem 

 opposite the leaf, and become synochreate (avv, together), as in Astragalus 

 (fig. 193 s). The union or adhesion of stipules is not an accidental 



Fig. 190. Branch, r, and two leaves, //, of Cephalanthus occidental's, s, Interpetiolary or 

 interfoliav stipule, formed by the partial union of two. 



., formed by the union of two. 



Fig. 193. Branch, r, and portion of the leaf, /, of Astragalus Onobrychis, with a synochreate 

 stipule, formed by the union of two stipules on the opposite side of the branch from that to which 

 the leaf is attached. The leaf is pinnate, and in the figure three pairs of leaflets or pinnae are 

 left 



