Biennial of the Campanulaceae family, this subspecies is endemic to central Greece, where it is associated with the surroundings of Delphi and the nearby limestone massifs, notably Mount Parnassus. It grows in fine screes, cliff fissures, and very draining limestone rockeries, in warm and bright exposure.
It is distinguished from other subspecies of Campanula topaliana by a generally more compact habit and basal leaves with a blade less broadly cordate than in subsp. cordifolia, but still densely tomentose, with a characteristic silvery-gray, crenate margin. The rosette, tight and close to the ground, shows a marked adaptation to rocky conditions and Mediterranean summer aridity.
The flowers, borne on fine often reddish pubescent stems, are tubular bells with star-spread lobes, of a clear lilac-violet, with noticeable pubescence on the calyx and the throat of the corolla.
In its natural habitat, its flowering extends from May to July. In cultivation under temperate climate, it occurs rather from June to August. The plant being monocarpic, continuous sowing is essential to perpetuate the collection.
The cultural requirements are identical to the rest of the group: absolute drainage, very mineral limestone substrate, full sun, and winter protection against stagnant moisture. Cultivation in a pot or alpine box under an unheated cold shelter is perfectly suitable.