Banksia petiolaris.
Banksia petiolaris is a species of flowering plant of the family Proteaceae native to Western Australia, where it is found in sandy soils in the south coastal regions from Munglinup east to Israelite Bay. It was first described by the botanist Ferdinand von Mueller in 1864. B. petiolaris grows as a prostrate shrub, with horizontal stems and thick, leathery upright leaves. The leaves can be viable for up to 13 years—the longest-lived of any flowering plant recorded. Yellow cylindrical flower spikes (pictured), up to 16 cm (6 1⁄4 in) high, appear in spring. As the spikes age, they turn grey and develop up to 20 woody seed pods each, known as follicles. Insects such as bees, wasps and ants pollinate the flowers. B. petiolaris regenerates by seed after bushfire. The species adapts readily to cultivation, growing in well-drained sandy soils in sunny locations. It is suitable for rockeries and as a groundcover.
