Petrophile serruriae

Petrophile serruriae is an erect or spreading shrub that typically grows to a height of 0.2–1.5 m (7.9 in – 4 ft 11.1 in). It has silky-hairy branchlets and leaves but does not form a lignotuber. The leaves are bipinnate or tripinnate, 15–34 mm (0.59–1.34 in) long on a petiole 2–10 mm (0.079–0.394 in) long, with mostly twenty-seven to thirty-five needle-shaped, sharply-pointed lobes. The flowers are arranged on the ends of branchlets and in leaf axils with oval heads about 10 mm (0.39 in) in diameter, with a few deciduous involucral bracts at the base. The flowers are 13–16 mm (0.51–0.63 in) long, silky-hairy and yellow, greyish mauve to pink. Flowering mainly occurs from July to December and the fruit is a nut, fused with others in an oval to spherical head 10–12 mm (0.39–0.47 in) in diameter.

Petrophile serruriae is common in coastal limestone and is widespread from near Geraldton to near Albany in the south-west of Western Australia.