Xanthorrhoea semiplana F. Muell.

Kangaroo Island grass tree (Xanthorrhoea semiplana tateana). Cape Cassini, Kangaroo Island, South Australia. Kangaroo Island grass tree (Xanthorrhoea semiplana tateana). Stokes Bay, Kangaroo Island, South Australia.

Xanthorrhoea semiplana is a species of grass tree found in south-eastern Australia. It has two subspecies:

Xanthorrhoea semiplana ssp. semiplana – Tufted grass tree, found on the Eyre, Yorke and Fleurieu Peninsulas, south-eastern South Australia and probably central-western Victoria Xanthorrhoea semiplana ssp. tateana – Kangaroo Island grass tree, Tate's grass tree or Yakka Bush