But new exclusion fences are giving Bossiaea fragrans a better chance of survival by keeping hungry feral goats away.

Bossiaea fragrans is only found in the Abercrombie Karst Conservation Reserve, near Trunkey Creek, on an adjacent travelling stock route and nearby roadside verge along Goulburn Road.

NSW Department of Planning, Industry and Environment (NSW DPIE) threatened species officer Madelaine Castles said Bathurst Regional Council, National Parks and Wildlife Service (NPWS) and Central Tablelands Local Land Services (LLS) are collaborating to secure a future for the critically endangered plant.

"With a population of only approximately 400, each plant is valuable and the plants outside of the reserve are particularly vulnerable to threats like browsing by feral animals and accidental human damage," Ms Castles said.

"Through the support of LLS and council, new browsing exclusion fences have been built on the travelling stock route and roadside verge to protect the plants.

"This will hopefully lead to recruitment of new plants to increase the population."

An exclusion fence built inside the Abercrombie Karst Conservation Reserve has proven to be successful in stopping feral goat browsing and promoting new plants, according to the NSW DPIE.

In addition, the NPWS says 616 goats have been removed from the reserve over the past four years.

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Bossiaea fragrans, an erect shrub that grows one to 2.5m high, has characteristic flat stems known as cladodes.

The flowers, which can be seen from September to October, are yellow with red markings.

"Additional populations of this plant are still being sought, so if you think you have seen it in the area, get in contact with your local LLS, national parks office or DPIE threatened species team," a DPIE spokesperson said.