Sunflower Seed Arrangements
This Demonstration shows the distribution of sunflower seeds as a function of the number of seeds . Generally, sunflowers have 800–2000 seeds. The function has the form , , where is the golden ratio and is an arbitrary constant (here ).
 H. Vogel, "A Better Way to Construct the Sunflower Head," Mathematical Biosciences, 44(3–4), 1979 pp. 179–189. doi:10.1016/0025-5564(79)90080-4.