Helianthemum urrielense

Perennial sub-shrub of the Cistaceae family, endemic to the Picos de Europa, in northern Spain — limestone massif of Asturias and Cantabria. It grows on limestone rocks and scree, in sun-exposed cracks and rocky ledges, between approximately 800 and 2,000 meters altitude. It is one of the most strictly mountainous and localized species of the genus in Western Europe.

The plant forms a low, dense, and compact tuft, 10 to 20 cm in height, spreading in a tight cushion between the rocky blocks. The stems are woody at the base, short and branched. The leaves are small, oval, dark green on the upper side and grayish tomentose underneath, giving the tuft a characteristic bicolored appearance when the wind slightly lifts them.

The flowers are bright yellow, with five well-opened petals, modest in size but produced in large numbers, generously covering the cushion at the time of flowering. In its natural habitat, its flowering extends from June to August depending on the altitude.

In cultivation, it requires a limestone soil, very well-drained, in full sun, with good winter freshness. It is suitable for alpine rock gardens and mountain gardens, and tolerates windy exposure well. Its rarity makes it a sought-after species for collectors specializing in limestone rock plants.