conyza bonariensis

Erigeron bonariensis is a species of Erigeron, found throughout the tropics and subtropics as a pioneer plant; its precise origin is unknown, but most likely it stems from Central America or South America. It has become naturalized in many other regions, including North America, Europe and Australia.

Common names include flax-leaf fleabane, wavy-leaf fleabane, Argentine fleabane, hairy horseweed, asthma weed and hairy fleabane.

Erigeron bonariensis grows up to 75 cm (29.5 in) in height and its leaves ...