Sinapis arvensis is a plant from the family Brassicaceae, it's commonly known as wild mustard or charlock. A native of Europe, it has also become naturalized throughout much of North America. It is an annual or winter annual up to 1 m tall. The stems are erect with coarse spreading hairs near the base. The basal leaves are pinnatifid to dentate. The cauline leaves are much reduced and are short petiolate to sessile but not auriculate-clasping. The inflorescence is a raceme made up of yellow flo… (More on Charlock)