64 BUDS AND STIPULES 



6. Equitant : when the leaves are folded one over 

 the other, as in Grasses, Sedges, Iris, and many other 

 Monocotyledons (tig. F). 



7. Convolute : when rolled up from one margin 

 i.e. one margin within, the other without the coil, as in 

 the Cherry, Peach, Pea, Vetch, &c. (fig. G). 



There are sometimes considerable differences be- 

 tween nearly allied species ; and in some cases the outer 

 and inner leaves of the bud assume different positions. 



The conduplicate arrangement seems to follow natu- 

 rally from the mode of development described on p. 47. 

 The rudiment of the leaf, spreading more or less 

 round the growing-point, assumes a hollow form, and 

 when it rises above the central axis would thus become 

 folded on itself. 



In pinnate leaves generally, as in those of the Rose, 

 each leaflet is conduplicate. 



In palmate leaves the folded arrangement is that 

 naturally best calculated to enable them to fit into the 

 bud. 



The involute and revolute types perhaps have refer- 

 ence to the later life of the leaf, as affording a certain 

 protection against too rapid transpiration. 



The equitant type follows naturally from the mode 

 of growth of many Monocotyledons. 



Leaves of the same form may be folded in very 

 different ways, and it is seldom that the same plan runs 

 through a whole family, at least among Dicotyledons. 



