48 Plants and thei?- Ways in South Africa 



and dividing it into three sections. Imagine the centre to be 

 the tip of the stem. Beginning where one of the Hnes cuts the 



Fic. 57. — Spirals showing \, f , f. Phyllotaxy. 



outer end of the spiral, place leaf number one. Two and three 

 will fall on the other lines. The fourth will be in line with the 

 first. By placing each succeeding leaf one-third of the way 





