Sigesbeckia orientalis

Sigesbeckia orientalis, known as eastern St Paul's-wort and common St. Paul's wort, is a species of plant from Asteraceae used in traditional medicine to treat syphilis, leprosy and other skin-related illnesses. Sigesbeckia orientalis has a broad distribution in Africa, Asia, but has been widely naturalised outside this range. It is unclear whether it is native to Australia or has been introduced there. Academician Johann Siegesbeck who disagreed with Linnaeus' sexual system of classification based on plants' reproductive organs, described his work as 'loathsome harlotry'. Linnaeus named the small, ugly weed Sigesbeckia orientalis after Johann Siegesbeck for revenge.