Myrtle leaf milkwort (Polygala myrtifolia).
Polygala myrtifolia has blooms throughout the year with a peak in spring ( August to October) when the plants flower profusely. The fruit is a small, winged capsule. Polygala myrtifolia is an attractive evergreen shrub able to adapt to most gardens and gardeners. The closely resemble pea-shaped flowers, but are actually quite different in structure.
If you want more information about this flower, just search the plant's Latin name on Google: