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Plant organs are often arrangedin spiratpatterns. This effwt is termed spiral phyllotaxis. Well known examples include the layout of seeds in a sunflower head and the arrangement of scales on a pineapple. l%is paper presents a method for modeling spiral phyllotaxis based on detecting and eliminating collisions between the organs while optimizing their packing.
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Fowler et al. (1992) studied this question.