The arrangement of leave on a stem is known as Phyllotaxy. It varies from plant to plant.
There are three different types of arrangement of leaves- Alternate arrangement, Opposite arrangement and Whorled arrangement.
Alternate arrangement: In this arrangement only one leaf arises from each node. The leaves are attached to the stem in a spiral pattern. The leaves of sunflower, mango and China rose are the some example of this arrangement.
Opposite arrangement: In this arrangement a pair of leaves of arises from from the same node but the leaves grow to opposite side to each other. Guava and Jasmine are the example of this arrangement.
Whorled arrangement: In this arrangement a set of three or more leaves grow grow from the same node. Neriun Oleander and Alstonia Scholaries are the some example of this arrangement.