Setaria verticillata
Setaria verticillata is a species of monocotyledonous plant in the Poaceae family, native to the Old World.
It is an annual herbaceous plant with C4 physiology and a spreading habit that can reach a metre in height.
This species has spread to many temperate and tropical regions of the world and behaves like a crop weed, which is also the vector of various plant diseases and pests.
Populations of this species have been reported to be resistant to atrazine and other herbicides.()