The Banyan tree has adventitious roots i.e. prop roots for support.
Bougainvillea has thorns which are nothing but the modified axillary buds which protect the plants from grazing animals.
In Alstonia, leaves arise at the node and form a whorl thus giving it a whorled phyllotaxy.

When a flower can be divided into two equal radial halves in any radial plane passing through the centre, it is said to be actinomorphic, e.g., mustard, datura, chilli. When it can be divided into two similar halves only in one particular vertical plane, it is zygomorphic, e.g., pea, gulmohur, bean, Cassia.