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

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

. It grows as a multi-stemmed mallee reaching 4 metres in height. The bark is smooth, grey or greenish. It grows on poor shallow sandstone soils from

Ku-ring-gai Chase National Park Ku-ring-gai Chase National Park is a national park on the northern side of Sydney in New South Wales, Australia. The park is north of the Sydney central business district and generally comprises the land east of the M1 Pacific Motorway, sout ...

to Jervis Bay. ''Eucalyptus obstans'' was first formally described in 1991 by Lawrie Johnson and Ken Hill in the journal '' Telopea'', but the Australian Plant Census considers ''E. obstans'' to be a

synonym A synonym is a word, morpheme, or phrase that means exactly or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are all ...

of '' E. burgessiana''.

References

obstans Myrtales of Australia Flora of New South Wales Trees of Australia Mallees (habit) Plants described in 1991 {{Australia-rosid-stub