"Sunflowers seem to have a preference for arrangements with two series of spirals. A first serie consists of a Fibonacci-number spirals and a second serie, in opposite direction, in which the number is the next Fibonacci number. Although there are exceptions, the general rule is quite remarkable."[br](Chris Impens, pointing to a [url=https://royalsocietypublishing.org/doi/10.1098/rsos.160091]study by Jonathan Swinton[/url].)[br]The pictures below (with reference number) come from a [url=https://datadryad.org/stash/dataset/doi:10.5061/dryad.f9k77]database[/url] with this study.