Floral growth pattern, artwork. Many plants grow leaves and flowers that follow a mathematical sequence known as the Fibonacci series (1,2,3,5,8,13,21 etc). The division between two adjacent Fibonacci numbers is known as Phi (1.618). Each angle between each repeating spiral sequence is 137.5 degrees apart. This is known as the golden angle and can be calculated by the formula: 360 multiplied by 1 minus the reciprocal of Phi. The entire spiral pattern is known as Fermat's Spiral and can be seen in many plants such as the florets of a sunflower or a pine cone.