Do plants know math?

Michael sez: "Smith College has images of cool spiral patters formed by plants as they grow, showing fibonnacci sequences and other fractal forms."
For more than three centuries botanists and mathematicians have marveled at the complex and beautiful spiral patterns that form as plants develop. As they generate leaves around a stem, or seeds or flowers in a blossom, plants as diverse as broccoli, pinecones, artichokes and water lilies create intricate spirals that follow a well-known mathematical sequence of numbers.
Link Discuss (Thanks, Michael!)