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Grevillea renwickiana (a prostrate shrub) - endangered species listing

06 Dec 2002

The Scientific Committee, established by the Threatened Species Conservation Act, has made a Final Determination to list the prostrate shrub Grevillea renwickiana F. Muell.as an ENDANGERED SPECIES in Part 1 of Schedule 1 of the Act. Listing of endangered species is provided for by Part 2 of the Act.

NSW Scientific Committee - final determination

The Scientific Committee has found that:

1. Grevillea renwickiana F. Muell. (family Proteaceae) is described by R. O. Makinson (2002) in Harden, G. (ed). Flora of New South Wales. UNSW Press. Vol. 2. 2nd edition p. 46 as: Prostrate rhizomatous shrub forming mats rarely to c. 30 m across. Leaves divided, lanceolate to oblong in outline, 5-14 cm long, 2-8 cm wide, with 5-18 triangular to oblong lobes 0.5-3.5 cm long, 3-15 mm wide, sometimes lower lobes 2- or 3-toothed; lower surface with an open to dense appressed indumentum. Conflorescences few, usually secund, 2-2.5 cm long. Perianth cream to pinkish grey, loosely subsericeous outside, glabrous inside; flowers sometimes with a number of styles. Gynoecium 26-31 mm long; ovary densely hairy; style pale pink to red, glabrous except near base; pollen presenter oblique. Sterile, follicle not known to be produced. Flowers summer. Grows in open dry sclerophyll forest on sandy soils; confined to the Braidwood-Nerriga area.

2. The species is a NSW endemic restricted to six populations between Nerriga and Charleys Forest on the Southern Tablelands.

3. The total number of individuals, while difficult to estimate due to the rhizomatous and prostrate habit of the species, is estimated to be between 3000 and 5000. Three of six populations, containing approximately 75% of all individuals, occur within Morton National Park, with the remainder occurring on private property and along road-verges.

4. The existing populations are highly fragmented due to previous clearing of habitat for agriculture. The populations on private property and along road verges are threatened by further clearing and all populations are potentially threatened by inappropriate fire regimes. The species is also threatened by fire control activities.

In view of the above the Scientific Committee is of the opinion that Grevillea renwickiana F. Muell. is likely to become extinct in nature in New South Wales unless the circumstances and factors threatening its survival or evolutionary development cease to operate.

Proposed Gazettal date: 06/12/02
Exhibition period: 06/12/0 - 24/01/03

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Threatened Species Scientific Committee

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