The arrangement of leaves on a stem.

phyllotaxi is the arrangement of leaves in the stem....

Because it is so interesting.

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Fibonacci first published a use for the pattern to explain bunny population growth in his book Liber Abaci (1202).

Other interesting uses for the Fibonacci Sequence:

• The Golden Ratio and The Golden Spiral (as seen in DaVinci's Vitruvian Man)
• Phyllotaxis (how leaves appear on stem)
• Predicting stock share pricing (Fibonacci retractment)
• Graphs interconnecting parallel and distributed systems (Fibonacci Cubes)
• The Core in Cornwall, UK (architecture)
• The chorus of Astronomy, a hip-hop song by Black Star
• The time signatures and syllable structure of the Toolsong Lateralus
• Ancestry of male bees