The invasive North American plant species Parthenium hysterophorus, commonly known as Santa Maria feverfew and famine weed, is now present in Africa, Australia, and India, where it is locally known in English as congress grass. The invasive North American plant species Parthenium hysterophorus, commonly known as Santa Maria feverfew and famine weed, is now present in Africa, Australia, and India, where it is locally known in English as congress grass. Ecology Agriculture Phys.org – latest science and technology news stories