Acanthospermum australe

Acanthospermum australe (Paraguayan starburr, Ihi kukae hipa, Paraguay bur, Paraquay starbur, Pipili, Sheepbur, Spiny-bur) is a South American species of herbaceous plants first described as a species in 1758.
Distribution.
The species is native to:
It has been introduced in China, and is an invasive species in parts of the United States, Canada, and South Africa. It is currently a widespread pioneer in the tropics and sub-tropics.
Extracts.
Extracts of "Acanthospermum australe" have "in vitro" antiviral activity against herpesvirus and poliovirus, but clinical effects have not been studied.