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phyllotaxis
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(top, left) Leaf shapes may confuse you.
(center) Shape by phyllotaxis or differentiation?
(right) 2x5=10, and notice the jumping stamens.
(mid row) 21 - Deviations to 19 and 23 are still part of a Fibonacci phyllotaxis here, for ray flowers are differentiated in annulars, and may be not in the parastichies, the latter appearing in Fibonacci numbers.
(right) Imagining the height of this plume, you can see the spiral as a helix. But in this projection, the triangle is evident.
(bottom) 21 and 34 parastichies. Even in the young flower there is much countable.
(right) Seeds of the adult sunflower head are covered by little 5-flowers. These are closepacked in triangular and square grids. But the center is chaotic.