swamp gum

swamp gum Any of various species of Eucalyptus found in Australia.
1983, Robert Drewe, The Bodysurfers, Penguin 2009, p. 51:

Two years before, under the swamp-gum in their Mosman garden, away from the children's ears, they had talked of separating, but the discussion itself, conducted around mugs of coffee in those green and secure surroundings, had scared them out of it.