Plants : {# of Elements}

diagram of leaves
Fibonacci numbers appear in the arrangement of leaves of the branches of some trees. The leaves grow in spirals around each branch. The number of leaves in each full rotation (from one leave out along a branch until the one directly above it is reached) is often a Fibonacci number. Also, the number of rotations on each branch is often a Fibonacci number. Some trees that display this pattern are beech trees, poplars, willows, and elms.

A good outside link to follow for more on leaf rotations is, again, the "Practical Procedural Modeling of Plants" article, <>.

Downwards in the tree: {Plants}

(Sources: leaves image, <htpp:// ProfStds/EvTeachM3.htm
>. See bibliography.)