Setaria pumila is a species of grass known by many common names, including
yellow foxtail,
yellow bristle-grass,
pigeon grass, and
cattail grass. It is native to Europe, but it is known throughout the world as a common weed. It grows in lawns, sidewalks, roadsides, cultivated fields, and many other places. This annual grass grows 20 centimeters to well over a meter in height, its mostly hairless stems ranging from green to purple-tinged in color. The leaf
(Wikipedia)