Parthenium weed

Family: Asteraceae
Scientific name: Parthenium hysterophorus
Description: Plant Form Annual rosette multi-branched herb. Size 50 cm to 2 m tall. Stem Erect and ribbed single stem, many branched above. Leaves Initially rosette, upper leaves deeply divided, covered in soft fine hair. Flowers Creamy white, in circular clusters, loosely branched in flowerhead. Dotted with resin. Fruit and Seeds Seeds tiny 1-2 mm across, triangular, brown to black. Habitat Roadsides, paddocks, flooded areas. Distinguishing Features Creamy white daisy-like flower clusters are distinctive, as are ribbed stems. Impacts Highly toxic to animals and humans, threatens biodiversity.

Example images for this weed