Myrtle-leaf milkwort is a tropical evergreen shrub, the most common forms reach about 3-6 ft in height with a few upright-growing stems and slender branches densely covered with leaves that resemble myrtle.

Myrtle-leaf Milkwort, September bush (Polygala myrtifolia).

It is a common, widespread shrub with pretty mauve flowers on and off throughout the year with a peak in spring.