PhaseLab
The unramificated plant body can be regarded to be built-up with 3 parts. These are seed lobes, stem, and inflorescence: two spheres, a cylinder, a hemisphere.
phyllotaxis
A vascular unit is defined by 3 units: the primordium and it's supporting predecessors. Three spheres, one triangle.
The S-curve for growth processes is used to calculate relative growth for primordia and stem. Initial primordia on a premature stem are big compared with their substratum. Primordia on an initial sunflower head are small on the enlarged apical dome.
Fine-tuning in positioning is a local problem with 3 influences.
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The relation between the computer program Apex and the Stack-and-Drag Model is presented in the next pages.

First, here are four assumptions. Click on the diagram to magnify.