Parthenium weed

Parthenium hysterophorus

family

Asteraceae

origin

Exotic

declaration

Category 3 Restricted Matter (Biosecurity Act 2014)

Category 3 Restricted Matter (Biosecurity Act 2014)

Must not be distributed or disposed. This means it must not be released into the environment unless the distribution or disposal is authorised in a regulation or under a permit.

Common names

Parthenium weed, False ragweed, Bitter weed, Carrot grass, Congress grass, Parthenium, Santa Maria.

A short-lived herbaceous plant forming a basal rosette of leaves in the early stages of growth. Later producing an upright stems that are ribbed lengthwise, hairy, and much-branched at maturity. Its leaves are deeply divided and fern-like in appearance, but are smaller towards the top of the plant. Large numbers of small white flower-heads (4-5 mm across) are borne at the tips of its branches. These flower-heads produce five small winged 'seeds' (about 2 mm long).

Leaf arrangement:Simple
Leaf form:Alternate
White
Green
48BFB2B5-D573-4E91-B7A1-0B51D3FF42E9Discoloured

Impact

Impact

Parthenium weed (Parthenium hysterophorus) is one of the 20 Weeds of National Significance (WoNS). It is regarded as a significant evironmental weed in Queensland, and as a potential environmental weed in New South Wales, Victoria, the Northern Territory and Western Australia.

Location

Location

Characteristics

Characteristics

Similar Species

Similar Species

Control Methods