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The sunflower an annual plant is native to the Americas. The flower petals within the sunflower's cluster are always in a spiral pattern. Generally, each floret is oriented toward the next by appropximately the golden angle, 137.5 degrees, producing a pattern of interconnecting spirals, where the number of left spirals and the number of right spirals are successive Fibonacci numbers. This pattern produces the most efficient packing of seeds within the flower head.