Eucalyptus obstans, commonly known as the Port Jackson mallee, is a common eucalyptus of south eastern Australia.

It grows as a multi-stemmed mallee reaching 4 metres in height.

It grows on poor shallow sandstone soils from Ku-ring-gai Chase National Park to Jervis Bay.

[2] Eucalyptus obstans was first formally described in 1991 by Lawrie Johnson and Ken Hill in the journal Telopea,[3] but the Australian Plant Census considers E. obstans to be a synonym of E.

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