perennial 20-45cm in height in bloom. Leaves bi- to tri-pinnatisect, the ultimate linear leaflets only 1mm or less wide, grey-glaucous. Inflorescence dense, the final branches more or less racemose. Flowers yellow, the petals oblong with undulate margins, summer. South-west Europe and very locally as far east as Turkey and south as northwest Africa, on stony banks and amongst scrub (macchie). The best species for the rock garden, worth growing for its low-growing foliage alone.