Question: Which form of plant is only found in Australia, Hakea or Blechnum?
Sentence (from "Blechnum"): By far the greatest species diversity is in tropical regions of the Southern Hemisphere, with only a few species reaching cool temperate latitudes in the Southern Hemisphere (notably "B. penna-marina", south to Cape Horn, Chile, the southernmost fern in the world) and Northern Hemisphere (notably "B. spicant", north to Iceland and northern Norway).
Relevant evidence: Yes