[2] The population on Norfolk island, sometimes treated as a distinct subspecies, is critically endangered.

[4] Pouzolzia australis is a shrub or small tree 1–8 m (3–26 ft) tall, densely branched and with a spreading crown.

[5] As of January 2024[update], the treatment as the single species Pouzolzia australis was accepted by Plants of the World Online.

[2] As of January 2024[update], an online publication from the New Zealand Plant Conservation Network accepted both the placement in Pouzolzia and sinking B. australis subsp.

dealbata into P. australis, but suggested more work is needed to confirm the inclusion of B. calophleba.

[4] On Lord Howe Island, the species is generally uncommon, but is locally abundant in the moist forests of the southern parts of the island, where it forms an association with Piper species on the north-western slopes of Mount Lidgbird.