Herzegovinian bellflower is a fragile perennialcushion plant with a length of 12–20 cm, sometimes 40 cm. It has a thick, lumpy semiwoody rhizome which can penetrate deep into the cracks of limestone cliffs. Its stems are numerous, square, and highly bendable. The leaves of sterile individuals are gathered in tufts, ovate, pointed, with a heart-shaped base. Both sides have 2–3 teeth and stems are about three times longer than the lamina.
It blossoms from June to August. The flowers are in clusters of 2–5, with 1–3 bracts. The crown is bare, light blue, split into five triangular lobes.
The fruit is a poricidalcapsule containing numerous seeds. It opens on the side, thanks to the 3-5 holes, and the top of the fruit remains closed. The seeds are about 1 mm in length and about 0.3 mm wide. The diploidchromosome of these bellflowers is 2n = 24.[1][2]
