Nature conservation

Threatened species

Blue Gum High Forest in the Sydney Basin Bioregion - profile

Indicative distribution

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The areas shown in pink and/purple are the sub-regions where the species or community is known or predicted to occur. They may not occur thoughout the sub-region but may be restricted to certain areas. ( click here to see geographic restrictions). The information presented in this map is only indicative and may contain errors and omissions.
Scientific name: Blue Gum High Forest in the Sydney Basin Bioregion
Conservation status in NSW: Critically Endangered Ecological Community
Commonwealth status: Not listed
Gazetted date: 20 Apr 2007
Profile last updated: 04 Mar 2024


A moist, tall open forest community, with dominant canopy trees of Sydney Blue Gum (Eucalyptus saligna) and Blackbutt (E. pilularis). Forest Oak (Allocasuarina torulosa) and Sydney Red Gum (Angophora costata) also occur. Species adapted to moist habitat such as Lilly Pilly (Acmena smithii), Sandpaper Fig (Ficus coronata), Rainbow Fern (Calochleana dubia) and Common Maidenhair (Adiantum aethiopicum) may also occur. Contains many more species and other references should be consulted to identify these.


Originally restricted to the ridgelines in Sydney's north from Crows Nest to Hornsby, and extending west along the ridges between Castle Hill and Eastwood. In 2000 there was less than 200 hectares remaining (about 4.5% of its original extent). It only occurs in small remnants of which the largest is less than 20 hectares. The remnants mainly occur in the Lane Cove, Willoughby, Ku-ring-gai, Hornsby, Baulkham Hills, Ryde and Parramatta local government areas. An example of Blue Gum High Forest can be seen at the Dalrymple-Hay Nature Reserve, St Ives.

Habitat and ecology

  • Occurs only in areas where rainfall is high (above 1100 millimetres per year) and the soils are relatively fertile and derived from Wianamatta shale. In lower rainfall areas, it grades into Sydney Turpentine-Ironbark Forest.
  • The rainforest understorey species rely on birds and mammals to disperse their seeds and are vulnerable to fire.
  • Along the drier ridgelines, fire would have been more frequent and an important factor in maintaining understorey diversity.
  • The community also occurs on soils associated with localised volcanic intrusions, 'diatremes' .

Regional distribution and habitat

Click on a region below to view detailed distribution, habitat and vegetation information.


Recovery strategies

Activities to assist this species

Information sources

IBRA Bioregion IBRA Subregion Known or predicted Geographic restrictions region
Sydney BasinCumberland Known None
Sydney BasinPittwater Known None
Sydney BasinSydney Cataract Predicted None
Sydney BasinYengo Known None