4. Explain with suitable examples the different types of phyllotaxy.
The pattern of arrangement of leaves on the stem or branch is called Phyllotaxy. There are three types of phyllotaxy found in plants.
1. Alternate phyllotaxy- On a branch, a single leaf arises at each node. E.g China rose
2. Opposite phyllotaxy- At one node, two leaves arise, opposite to each other. E.g guava plant
3. Whorled phyllotaxy- More than two leaves arise at a node and form a whorl in whorled phyllotaxy. E.g Alstonia