More needs to be done to save the endangered Acacia meiantha, with only three distinct populations in Mullion Creek, Carcalgong and Clarence.
Dr Richard Medd recently published a study with a compilation of field surveys about the small shrub.
The report found out of the 42,000 shrubs known, 96 per cent can be found in the Mullions Range State Forest sub-population.
"I started to write about the threatened species at the beginning of this year because of its limited geographic distribution and it doesn't occur in a conservation plan," Dr Medd said.
"I have no doubt that if we don't find a way to manage the plant in 100 years it will become extinct."
The plant has been listed as endangered under state and commonwealth legislation due to its restricted distribution, abundance and vulnerability to ongoing threats.
Dr Medd added with National Threatened Species Day on September 7, people need to be aware of the significance of the plant and how it impacts the ecosystem.
"This plant is one example of plants that are doing it tough because of over-development, land clearing and destruction of habitat," he said.
"In the Mullions Range State Forest, the shrub is threatened by plantation forestry operations and wilding pine invasion.
"As this plant is considered a legume, it naturally provides atmospheric nitrogen through its nodules and it helps to maintain nitrogen supply for the ecosystem."
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