Noun
The order or arrangement of leaves on the stem; the science of the relative position of leaves.
Source: Webster's dictionaryThe phyllotaxis is usually decussate, rarely whorled (e.g. Fadogia ), or rarely alternate resulting from the suppression of one leaf at each node (e.g. Sabicea sthenula). Source: Internet
This may be why angles close to the golden ratio often show up in phyllotaxis (the growth of plants). Source: Internet