ON THE FORMS OF STIPULES 1G1 



Mi'lilotus- pinnatipartite, as in Viola tricolor (fig. 27), 

 Passiflora pinnatistijmla, and Pomaria glandulosa; or 

 palmatipartite, as in Altluea rosea, A. ficifolia, Ptero- 

 spermtnn ac-erifolium, Sec. * 



In texture they may be foliaceous, as in the Hearts- 

 ease ; membranous, when thin, flexible, and almost trans- 

 parent ; scarious, when dry and coriaceous, as generally 

 in the Beech and Hornbeam; spinous, as in Robinia 

 (fig. 34) ; cirrhose, when produced into tendrils, as 

 in Smilax. 



In many cases the stipules are very small, sometimes 

 quite minute, as in Hymenanthera (fig. 28), a plant 

 belonging to the Violet family. The Holly is described 

 in Bentham and Hooker's ' Genera Plantarum ' as exstip- 

 ulate, but (fig. 29) there are minute black points at the 

 base of the leaves, which appear to represent stipules. 

 In others they are very large, as in the common Pea 

 (Pisum sativum) (fig. 26), Lathyrus maritimus (fig. 296), 

 and BucJclandia (fig. 190). 



Many plants have stipules of different forms. 



The stipules covering winter-buds are often different 

 in form from those of the subsequent leaves (see, for 

 instance, figs. 215-235). 



Where stipules serve as bud-scales there is generally 

 a series of different forms, from those of the outer 

 scale to those of the ordinary leaf. 



In the Thorn (Crataegus Oxyacantha) (fig. 286) the 

 stipules on the leaves of the short later.nl spurs and those 



M 



