Phyllotaxy means the arrangement of leaves on both stem and branches. Mainly the leaves are arranged in three ways:
Alternate: In this, each node gives rise to single leaf and these are arranged alternately giving a spiral form (e.g., mango, china rose etc).
Opposite: In this, each node gives rise to two leaves arranged opposite to each other.
It can be opposite superposed (e.g., lxora) or opposite decussate (e.g., Ocimum, Calotropis procera). In whorled phyllotaxy, more than two leaves develop from a single node (as in Nerium).