A short-lived herbaceous plant with upright or spreading stems usually growing 5-20 cm tall. Its soft stems and leaves are covered in hairs, some of which are sticky. Its relatively small leaves (5-32 mm long) are paired along the stems. Its small white flowers have five petals with deeply notched tips, and may appear to be ten petals at first glance. Its small fruit (5-10 mm long) have ten teeth at their tips.