Description: It has a woody base. The leaves are oblong grayish-hairy. The flowers are up to 1 m in size and are yellow. The fruit is a silicula that is very inflated, spherical. There are 4-8 seeds in each silicula.

Flowering time: March-June

Habitat: steep rocks, cliffs, screes

Interesting fact: a popular and very common species in horticulture around the world.