Acacia bynoeana (a shrub) - endangered species listing

NSW Scientific Committee - final determination

The Scientific Committee, established by the Threatened Species Conservation Act, has made a Final Determination to list the shrubAcacia bynoeana Benth. as an ENDANGERED SPECIES on Part 1 of Schedule 1 of the Threatened Species Conservation Act and as a consequence to omit reference to that species as a VULNERABLE SPECIES on Schedule 2 of the Act. Listing is provided for by Part 2 of the Act.

The Scientific Committee has found that:

1.Acacia bynoeana Benth. (Family Fabaceae) has been described (Flora of New South Wales, Vol 2, Harden 1991) as: Erect or spreading shrub, 0.2-1m high; branchlets more or less terete, more or less hairy. Phyllodes rigid, straight or subfalcate, 1-4 cm long, 1-2 mm wide, 3 longitudinal veins prominent, apex pungent-pointed; glands absent or 1 gland at base; pulvinus <2 mm long; stipules more or less spinescent, c. 1 mm long. Heads 10-25 flowered, golden yellow, 1 in axil of phyllodes; peduncle 3-6 mm long, hairy. Pod sometimes woody, straight to strongly curved, more or less flat, 1-2.8 cm long, 3-4 mm wide, margins thickened, brown; seeds longitudinal; funicle expanded towards seed. Flowers summer. Mainly in heath and dry sclerophyll forest on sandy soils; west of Frenchs Forest through to Berrima and Mittagong areas.

2. The species is currently known from about 30 locations. The size of populations where known is very small (1-5 plants) with only a few sites with 30-50 individuals.

3. Most of the known sites are not reserved, although populations are known from several reserves including Marramarra National Park, Castlereagh Nature Reserve, Lake Macquarie SRA, Blue Mountains National Park. Recent vegetation surveys in Royal National Park have not located the species. The species was also known from one site within Ku-ring-gai Chase National Park, but several subsequent searches of the site have failed to find any plants.

4. The main threats toA. bynoeanaare habitat disturbance (including road, trail and powerline maintenance, recreational vehicle use), clearing, weed invasion and too frequent fire. Due to the fragmented nature of the populations, their small size, fire mitigation activities and the proximity of urbanisation, the species is susceptible to catastrophic events and localised extinction.

5. In view of 2, 3 & 4 above the Scientific Committee is of the opinion that the species is likely to become extinct in nature in NSW unless the circumstances and factors threatening its survival or evolutionary development cease to operate.

Proposed Gazettal date: 17/9/99

Exhibition period: 17/9/99 - 22/10/99

About the NSW Scientific Committee

Page last updated: 27 February 2011