Petrophile heterophylla

Petrophile heterophylla is a spindly, non-lignotuberous shrub that typically grows to a height of 0.5–2 m (1 ft 8 in – 6 ft 7 in) and has glabrous branchlets and leaves. The leaves are more or less flattened, mostly about 140 mm (5.5 in) long and 2–6 mm (0.079–0.236 in) wide, linear to lance-shaped with a sharply-pointed tip, but sometimes pinnately-divided or lobed. The flowers are mostly arranged in leaf axils, sometimes on the ends of branchlets in sessile, oval heads 6–8 mm (0.24–0.31 in) long, with many overlapping involucral bracts at the base. The flowers are 10–15 mm (0.39–0.59 in) long, yellow to cream-coloured and silky-hairy. Flowering occurs from August to October and the fruit is a nut, fused with others in an oval to oblong head about 12 mm (0.47 in) in diameter.

This petrophile grows in low heath, dense scrub, open woodland and forest in the Stirling Range, east to an area between Ravensthorpe and Esperance and north to near Chittering, in the southwest of Western Australia.