Description: Herbaceous perennial, tufted appearance, up to 50 cm tall. The leaves are sparse, narrow and opposite. The flowers are up to 1 cm in size and are collected in loose inflorescences. The corolla has white or light pink petals with dark purple veins inside. The fruit is a 5-6 mm capsule large with black seeds.

Flowering time: April-September

Habitat: Dry, sunny rocky areas

Interesting fact: The Latin name of the genus in translation means rock, which corresponds to the rocky conditions in which the plant grows.