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Perennial of the Convolvulaceae family, this subspecies is native to the mountains of southern Spain, mainly the Sierra Nevada and the Betic ranges, where it grows on limestone rocks and high-altitude scree, between approximately 1,800 and 3,000 meters. It represents one of the forms most adapted to the extreme conditions of the genus, capable of withstanding the harsh cold and intense summer drought of these environments.
It forms small, dense, compact cushions, tightly against the rock, barely exceeding 5 to 10 cm in height. The leaves are very small, narrowly lanceolate, covered with a dense silvery silky pubescence that gives them a persistent metallic sheen, even outside of flowering. This silvery foliage, maintained all year round, is one of the major attractions of the plant and distinctly sets it apart from other rock garden convolvulus.
The funnel-shaped flowers, pure white to slightly pinkish, are borne individually above the cushion. In its natural habitat, flowering extends from June to August depending on the altitude. In cultivation, it generally occurs in May-June.
It requires perfect drainage, full sun exposure, and protection from stagnant winter moisture. It is preferably cultivated in well-drained rock gardens, in troughs or pots under cold shelter, in a poor mineral substrate.