I found an article on phyllotaxis (the arrangement of flowers and leaves around a plant stem) that seemed really interesting. As mentioned in class, leaves grow in a Fibonacci sequence around a stem so as to maximize access to sunlight. The most common angle between leaves is the golden angle (137.5 degrees). The paper went into the geometry of phyllotaxis, plant stem cells, mechanisms of phyllotaxis and phyllotaxic transitions.
Here is the paper for those who want to read more: