Dianella tasmanica, commonly known as the Tasman flax-lily or Tasmanian flax-lily is a herbaceous strappy perennial herb of the family Asphodelaceae, subfamily Hemerocallidoideae, found in southeastern Australia including Tasmania. It has leaves to 80 cm, and a flower stem to 1.5 m. Blue flowers in spring and summer are followed by violet berries. It adapts readily to cultivation and is commonly seen in Australian gardens. Unlike other Dianella species, its fruit is toxic.