The New South Wales Scientific Committee says a shrub, found only in the state’s upper Hunter, needs urgent protection to avoid extinction.
There are estimated to be between 300 and 2,000 pomaderris reperta plants around Denman.
There are three main populations.
The committee says it expects open-cut coal mining will threaten the biggest sub-population.
It wants the plant listed as critically endangered to protect it from mining, land clearing, roadworks and pollution.