Appendix 1—figure 1. Spiral phyllotaxis with divergence angle ${\displaystyle \varphi ={137.5}^{\circ }}$ and different distributions of radial positions.

(a) The first 10 primordia are depicted, with the generative spiral as a dashed line. The angle between successive organs is always equal to $\varphi$. The nearest neighbours of primordium $i$ are $i+3$ and $i+5$, hence the mode of this pattern is $(3,5)$. (b) 100 primordia are depicted, along with the 8 (resp. 13) parastichies oriented anticlockwise (resp. clockwise) indicated in cyan (resp. red), hence the mode of this pattern si $(8,13)$.

DOI: http://dx.doi.org/10.7554/eLife.14093.017