Also: golden angle, 137.5 degrees, sunflower spirals
Leaves and seeds often sit at about 137.5° from each other, producing Fibonacci-numbered spirals.
Only what the cited papers report.
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Okabe noted leaf primordia typically arise at the golden angle of 137.5° and examined whether this arrangement has biophysical, adaptive value.
As reported in: Okabe (2015). Biophysical optimality of the golden angle in phyllotaxis. Scientific Reports. doi:10.1038/srep15358
Douady and Couder reproduced Fibonacci phyllotaxis patterns in a physics experiment and simulation, arising from self-organization that converges toward the golden mean.
As reported in: Douady, Couder (1992). Phyllotaxis as a physical self-organized growth process. Physical Review Letters. doi:10.1103/PhysRevLett.68.2098
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