ON THE FORMS OF STIPULES 171 



are similar in form, but in some cases they are more 

 or less dissimilar. 



Thus, in Azara dentata, a plant from Chili belonging 

 to the exotic family Bixinece, the two rows on the upper 

 side of the branches are foliaceous and evergreen, re- 

 sembling the leaves in shape, toothing, texture, and 

 hairiness, while the two rows on the lower side of the 

 branches are minute, subulate, hairy, and brown or 

 black in winter. The two sets are also very unequal 

 in A. microphylla and A. Gillesii. In A. celastrina, on 

 the other hand, both series are minute. 



Again, in Abuiilon megapotamicum the stipules 

 are ovate, acute, concave, unequal at the base, the 

 side away from the petiole being the larger, and that 

 next the petiole cut away ; they are unequal in size, 

 that on the upper side of the drooping branches being 

 broader, and often longer, than that on the under side. 

 They appear to be about as persistent as the leaves, 

 and amply protect the terminal buds. 



In Diplophractum, a genus of Sterculiacece from 

 Java, the stipules are also dimorphic. Both are leafy 

 and bullate, but while one of each pair is bifid and 

 bristly, the other is entire. 



In Ervummonant/ws (fig. 293), a leguminous forage 

 plant, one of the stipules in each pair is small and 

 subulate, the other comparatively large and deeply cut 

 into narrow segments. The larger one shows consider- 

 able variation in size and the amount of its segment- 

 ation. 



