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Austroeupatorium inulifolium

Description
 

Austroeupatorium (Austroeupatorium inulifolium) is a scrambling shrub that can grow to 5 m high. Its stems have a dense covering of short hairs. The leaves are hairy, opposite and on a stalk. The lance-shaped leaves are 7-18 cm long and 2.5-8 cm wide with toothed margins. The flowerheads are 2-3 mm wide and contain 8-15 fragrant small cream tubular flowers surrounded by 3-4 bracts (modified leaves). Each flower is up to 5 mm long. The flowerheads occur in irregularly branching clusters. The seeds are ribbed, to 1.5mm long with numerous white hairs about 4 mm long at the apex (Hsu et al. 2006).

For further information and assistance with identification of Austroeupatorium inulifolium, contact the herbarium in your state or territory.

Distribution:

Austroeupatorium is not currently naturalised in Australia. The potential distribution includes the far north of the Northern Territory and Western Australia and the eastern coastline of Queensland and far northern New South Wales (Thorp & Wilson 1998 - ). The only known Australian occurrence has been on the Cocos (Keeling) Islands (Williams 1994).

Habit:Shrub
Key points:
  • Austroeupatorium (Austroeupatorium inulifolium) is a scrambling shrub with fragrant small cream tubular flowers.
  • It is not currently naturalised in mainland Australia.
  • In other countries it is an aggressive species known to rapidly colonise areas cleared for agriculture.
How it spreads:

Austroeupatorium is spread by wind dispersed seed (Thorp & Wilson 1998 - ).

Where it grows:

Austroeupatorium is a weed of savannas, swamps, forest borders, disturbed areas, including disturbed forest, plantations, perennial crops and roadsides (Thorp & Wilson 1998 - ).

Flower colour:White
Distribution map:

Austroeupatorium is not currently naturalised in Australia (Thorp & Wilson 1998 - ).

Impacts:

Although Austroeupatorium is not currently naturalised and thus does not yet impact on Australian environments, overseas it is known to be an aggressive species known to rapidly colonise areas cleared for planting new crops and agricultural and fallow fields (Hsu et al. 2006).

The Northern Australian Quarantine Service (NAQS) maintains, and periodically reviews, target lists of exotic invasive species which could enter through Australia's northern border and are serious threats to Australia's productivity, export markets and the environment. Austroeupatorium is on the target list for exotic weeds that could enter into Australia (DAFF 2007).

Origin:

Austroeupatorium is native of Central and South America and the Caribbean Islands (Thorp & Wilson 1998 - ).

History:

Austroeupatorium is not currently naturalised in Australia (Thorp & Wilson 1998 - ).

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This database is designed to provide information, including biological and ecological, on invasive plant species that are on a national weed list, or are legislated against in a state or territory. While reasonable efforts have been made to ensure the accuracy of the information, no guarantee is given, nor responsibility taken, by the Commonwealth for its accuracy, currency or completeness. The Commonwealth does not accept any responsibility for any loss or damage that may be occasioned directly or indirectly through the use of, or reliance on, the information contained in this database. The information contained in this database does not necessarily represent the views of the Commonwealth. This database is not intended to be a complete source of information on the matters it deals with. For further information on the images contained in the database please contact the copyright owner. All images in the weed identification tool are managed by the Australian Plant Image Index (APII). Various copyright conditions apply for these images. For further information on the copyright conditions of images contained in the database please contact the APII at: photo@anbg.gov.au.