Yellow foxtail, also known as Setaria pumila, is a type of grass that can be found in North America. It is often considered a weed, as it can grow in areas where it is not wanted. Some synonyms for yellow foxtail include foxtail grass, bristle grass, and fox brush. Other common names for this plant include yellow bristlegrass, yellow milletgrass, and pigeon grass. Yellow foxtail can thrive in a variety of environments, from agricultural fields to roadside ditches. It is easily recognizable by its distinctive yellow-brown color and the bristle-like spikes that protrude from its seed heads.