This small scrambling weed creates ground covering and often grows up and over lawn edging. It can germinate and grow at any time of the year in New Zealand.
It is hairless, has square stems, and occasional branches that are perpendicular to the stems and in opposite pairs. The leaves do not have stalks and grow in opposite pairs. Small black dots on the underside of the leave are sometimes visible – these are glands.
The flowers are orange to almost red in colour.