helianthemum

Helianthemum, commonly known as rock rose or sun rose, is a genus of about 110 species of flowering plants in the family Cistaceae. These plants are native to temperate regions of Europe, North Africa, and Western Asia. Helianthemum species are typically low-growing shrubs or subshrubs, often with woody stems and a spreading habit. They are well-suited to hot, dry conditions and are often found in rocky or sandy soils, hence their common names.

The leaves of Helianthemum are usually small, lance-shaped, and can be evergreen or deciduous depending on the species. They are often covered in fine hairs, which helps them to conserve water. The most striking feature of Helianthemum is its flowers, which are typically saucer-shaped and brightly colored. Petals are usually five in number and can range in color from white, yellow, pink, to various shades of red and orange. Some species have bicolored petals. The flowers are generally short-lived, often opening in the morning and closing by the evening, which is reflected in the genus name, derived from the Greek words "helios" (sun) and "anthemum" (flower).

Helianthemum species are popular garden plants, valued for their drought tolerance and long flowering period, often blooming from late spring through summer. They are frequently used in rock gardens, borders, and as ground cover. Many cultivars and hybrids have been developed for their specific flower colors and plant forms. They thrive in full sun and well-drained soil and require minimal maintenance once established.