MeiapJiyta Ran uncnlus. 



law, the succeeding spirals must be f, f, ^Vim an( * so on - 

 The law, however, does not always hold good amongst the 

 higher fractions, and seldom among the sporophylla and 

 perianth leaves, where various modifying influences come 

 into play. Now if a plant has large broad leaves, manifestly 



Fto. rco. COMPOUND 

 LEAF. (Thome). 



FIG. lot. DIAGRAM OF 

 SHRAU (Prantl). 



if they are to obtain a maximum of light and air, they must 

 be arranged on a wide spiral, and not in a whorl, else they 

 will cover each other. So, also, if the leaves are small and 

 narrow, they might well be arranged in whorls or close 

 spirals, and still be sufficiently exposed to the air and 

 light. 



