PhaseLab 

Date: August 14, 2003 / Observation Location: Genneperweg, Eindhoven, The Netherlands
Item numbers refer to the photographs.
item number 
(L, left) 
(R, right) 
55: L or R 




1 

55 
R 
2 
34 

R 
6 
55 

L 
7 

55 
R 
14 
47 
7375 
(Lucas) 
22 
34 

R 
23 
89 

R 
25 

55 
R 
32 

89 
L 
33 
55 

L 
35 
47 
29 
(Lucas) 
40 
55 

L 
47 

34 
L 
48 
55 

L 
51 

55 
R 
52 
55 

L 
54 
55 

L 
61 

89 
L 
75 
89 

R 
82 

55 
R 
84 

55 
R 
88 

89 
L 
89 
55 
89 
L 
100 
89 

R 
101 
89 

R 
102 
89 

R 
106 
89 

R 
120 

55 
R 
131 
55 

L 
135 

34 
L 




total 


13L,15R,2Lucas 




Of 135 photographed sunflowers, 30 capitula were examined for the occurence
of Lucas numbers (1, 3, 4, 7, 11, ...), and for right and left handed
parastichies.
In the table, only counted spirals are given. The last column shows the turning direction of the (expected) 55 parastichies. Conclusion: 2 of the 30 capitula, or 6,7%, showed Lucas numbered parastichies. The other sunflower heads had Fibonacci numbered parastichies with no significant preference for the turning direction (43,3% left, 50% right).
