Helianthemum, known as rock rose, sunroses, or rushrose, is a genus of about 110 species of evergreen or semi-evergreen subshrubs in the family Cistaceae. They are widely distributed in the Americas, Europe, and from North Africa to Asia Minor and Central Asia, with the centre of diversity in the Mediterranean region. The leaves are opposite, simple oval, 1-4 cm long and 0.5-2 cm broad, varying from glossy green to tomentose grey-green. The flowers are 2-4 cm diameter, with five petals, white o… (More on Helianthemum)