There is only one known species, Petromarula pinnata, endemic to the island of Crete in the Mediterranean.

[1][2] The name "Petromarula" means "rock lettuce" in Greek, a reference to the plant's traditional use in salads.

[3] Petromarula pinnata is a robust, medium to tall perennial, minutely hairy above.

Leaves mostly in a large basal rosette, pinnate to pinnately-lobed, the lower long-stalked; leaflets oval to oblong, coarsely toothed.

Flowers pale blue, 9–10 mm, borne in large rather narrow panicles; corolla with 5 spreading to recurved linear lobes.