Click on images to enlarge
habit (Photo: Chris Gardiner)
habit (Photo: Land Protection, QDNRW)
large leaves and flower clusters (Photo: Chris Gardiner)
whitish-coloured younger leaves (Photo: Chris Gardiner)
flower cluster (Photo: Forest and Kim Starr, USGS)
close-up of flower buds (Photo: Land Protection, QDNRW)
flowers (Photo: Steve Adkins)
close-up of flower (Photo: Chris Gardiner)
Calotropis gigantea (L.) Ait.
Asclepias gigantea L.
Asclepiadaceae (the ACT, Victoria, Tasmania, South Australia, Western Australia and the Northern Territory)Apocynaceae (Queensland and New South Wales)
bowstring hemp, calotrope, crownplant, giant calotrope, giant milkweed, giant rubber bush
Native to Iran, the Indian Sub-continent (i.e. India, Nepal, Pakistan and Sri Lanka), China and south-eastern Asia (i.e. Laos, Myanmar, Thailand, Indonesia and Malaysia).
Naturalised in northern Queensland, northern Western Australia and the northern parts of the Northern Territory.
This introduced shrub with milky sap is frequently cultivated as a garden plant (i.e. ornamental) in the tropical parts of northern Australia. It has become naturalised in drier tropical regions and in sandy coastal habitats and may be very easily confused with the more widespread and more significant environmental weed known as calotrope (Calotropis procera ).
Giant calotrope (Calotropis gigantea) may cause problems comparable to this species and has potential to invade degraded rangeland pastures, river flats and coastal dunes. For example, it is one of many ornamental species that is invasive along the sandy beachfronts of Far North Queensland.
Fact sheets are available from Department of Employment, Economic Development and Innovation (DEEDI) service centres and our Customer Service Centre (telephone 13 25 23). Check our website at www.biosecurity.qld.gov.au to ensure you have the latest version of this fact sheet. The control methods referred to in this fact sheet should be used in accordance with the restrictions (federal and state legislation, and local government laws) directly or indirectly related to each control method. These restrictions may prevent the use of one or more of the methods referred to, depending on individual circumstances. While every care is taken to ensure the accuracy of this information, DEEDI does not invite reliance upon it, nor accept responsibility for any loss or damage caused by actions based on it.
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