131 Conyza bonariensis (L.) Cronq.
Nome comune: Impia
Conyza bonariensis is a species of Conyza, found throughout the tropics and subtropics as a weed; its precise native origin is unknown, but most likely Central America or South America. Common names include Flax-leaf Fleabane and Wavy-leaf Fleabane.
It is a rare alien in south eastern England, found beneath walls and in cracks in pavements and concrete driveways. It flowers in August and continues fruiting until the first frosts (sometimes as late as Christmas Day in Berkshire). It is instantly recognisable by its blue-green foliage, very narrow, undulate leaves, and purple-tipped involucral bracts.