PHYLLOTAXY 



49 



111. Every plant has its own arrangement of leaves. 

 For opposite leaves, see maple, box-elder, ash, lilac, 

 honeysuckle, mint, fuchsia. For 2 -ranked arrangement, 

 see all grasses, Indian corn, bass wood, elm. For 3-ranked 

 arrangement, see all sedges. For 5 -ranked (which is 

 one of the commonest), see apple, cherry, pear, peach, 

 plum, poplar, wil- 

 low. For 8- ranked, 

 see holly, osage 

 orange. More com- 

 plicated arrange- 

 ments oe c u r i n 



bulbs, house leeks. 



and other condensed 

 parts. Tin arrange- 

 im nl of It art s on the 

 stt in is Jcnowti as 

 phyllotaxy (literally 

 " le a f - a rra nge- 

 nient".) Make out 

 the phyllotaxy on 

 any plant. 



111*. In some 

 plants, several Leaves 

 occur at one level, 



being arranged in a 

 circle around the stein 

 ticillate or whorled. 



WLm mm 

 TO. Rhubarb (frown In the liu'it- 



Such leaves are said to be ver- 

 Leaves arranged in this nay are 



usually narrow. 



L13. Although a definite arrangement of Leaves is the 

 rule in mosl plants, it is subject to modification. On 

 shoots which receive the light only from one side or which 



grow iii difficult positions, the arrange*men1 may no1 be 

 definite. Examine shoots which grow oh the under side 

 of dense tree-tops or in other partially Lighted positions. 



D 



