Prostanthera phylicifolia, commonly known as Spiked Mint-bush, is a species of plant in the Lamiaceae family. The species was first formally described by Victorian Government Botanist Ferdinand von Mueller in 1858 in Fragmenta Phytographiae Australiae.Plants have a compact or spreading habit, growing to between 0.5 and 2 metres high. The leaves have a rounded apex and cuneate or obtuse base and are 5 to 15 mm long and 1.5 to 4 mm wide, with the edges turned back.