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Alligator Alligator Weed was probably introduced into Australia at Carrington, the Newcastle docks area in NSW when ship's ballast was dumped. It was first recorded there in 1946 The leaves are shiny, dark green, spear-shaped and leaves on aquatic plants tend to be longer and wider than those on plants growing on land.

When growing on land it competes with and displaces native flora species along river and creek banks and in wetlands, and can be harmful to animals. When growing in fresh water, Alligator Weed can cover the entire water surface, preventing flow.

Boneseed

It was probably originally planted as a garden species and to stabilise sand dunes.

Boneseed grows up to 3 m high, boneseed is an erect shrub it is relatively short-lived (10-20 years). It has woody branched stems and oval shaped leaves .The yellow flowers have 5-8 petals and are up to 30 mm in diameter. The round fleshy green fruit turn black when mature and contain a single smooth round seed.

Boneseed has become an aggressive invader of native bushland in Australia.

It needs effective control programs to get rid of it.