How to grow Helianthemum From the Greek helios, the sun, and anthemon. a flower (Cistaceae). Sun Rose. A genus of evergreen and semi-evergreen shrubs, sub-shrubs, perennial plants and annuals, very free flowering. Numerous named varieties and hybrids are grown and four species are native plants. Species cultivated H. alpestre, 1 foot, a tufted alpine, yellow flowers, summer, European• alps. H. […]