R. gunnii is endemic to Tasmania. R. laetevirens and R. valdiviensis are from southern Chile and Argentina, the latter being restricted to the Valdivian temperate rain forest.
R. gunnii is unique to Tasmania. In contrast, R. laetevirens and R. valdiviensis originate from southern Chile and Argentina, particularly the Valdivian temperate rain forest, where R. valdiviensis has a more limited range.