The National Herbarium NSW of the Royal Botanic Gardens & Domain Trust in Sydney has been doing interesting scientific research into rainforest tree distribution and rarity in Northern NSW. They have found links between rarity and the relatively recent local extinctions of large fauna such as the Cassowary.
This video features scientists Dr Maurizio Rossetto and Dr Robert Kooyman. As well, it features the recently discovered and extremely rare tree Eidothea hardeniana as well as trees from the Gondwanan family Elaeocarpaceae.