The park includes a stand of River Red Gums (Eucalyptus Camaldulensis). Hybrids with river red gum ("Eucalyptus camaldulensis") are used to combat salinity. The national park consists of of "Eucalyptus camaldulensis" forest along the Murray River. Ulupna also contains an excellent example of river red gum ("Eucalyptus camaldulensis") open forest. It is the second most widely distributed species in Australia after "Eucalyptus camaldulensis". The larvae live in tunnels, feeding on "Casuarina pauper" and "Eucalyptus" species, especially "Eucalyptus camaldulensis". "Eucalyptus camaldulensis" has the widest natural distribution of any eucalyptus species. The vegetation of the reserve is mainly river red gum ("Eucalyptus camaldulensis") open forest.