RISING PHYLLOTAXIS. 



123 



Fig. 48. — Apices of seedlings of Helianthus annuus, cam. lucid, drawings. A and B, 

 cotyledons only showing ; A, symmetry for three pairs of leaves ; B, commence- 

 ment of asymmetry at the 5th leaf ; C, older seedling, symmetry maintained for 

 5 pairs ; D, asymmetry (2 + 3) above a symmetrical pair ; E, asymmetry (3 + 5) 

 following a decussate series and already changing at 8 to a higher series. 



