The Queensland Herbarium is asking everyone to keep an eye out for Praxelis clematidea, a weed of South American origin which is known to be highly invasive in most situations in north Queensland.
The plant forms dense swards and is not deterred by grazing as it is not eaten by stock. Like virtually all weeds, it is a particular threat in disturbed situations and roadsides.
It is easily confused with blue billygoat weed (Ageratum houstonianum) that is widespread on the island, but can be identified by differences in the shape of the flower heads, seeds and leaves.
The differences are demonstrated below.
If you find any Praxelis, the Herbarium would like you to send a specimen to The Queensland Herbarium, Brisbane Botanic Gardens Mt Coot-tha, Mt Coot-tha Rd, Toowong, 4066.
For more information on collecting, call 38969318 or email email@example.com