P. australis may refer to: Pachyornis australis, the crested moa, an extinct bird species Paracalliope australis, an amphipod crustacean species in the genus Paracalliope found in Australasia Petaurus australis, a marsupial native to eastern Australia Phaius australis, an orchid species Phasianella australis, the Australian pheasant, painted lady and pheasant snail, a medium-sized to large species of sea snail species found in Australia Phragmites australis, the common reed, a large perennial grass species found in wetlands throughout temperate and tropical regions of the world Planchonella australis (syn. Pouteria australis), the black apple, a tree species native to Australia Polylepis australis, the tabaquillo or queñoa, a tree species endemic of central Argentina Posidonia australis, the fibreball weed, a seagrass species found in the southern waters of Australia Pseudechis australis, the common king brown or Mulga snake, a highly dangerous snake species found in Australia Pseudomys australis, the plains rat, a threatened rodent species native to Australia Pseudophryne australis, the red-crowned toadlet, a ground frog species restricted to the Sydney Basin, New South Wales, Australia See also Australis (disambiguation)