If you see a lanky mustard plant with narrow stalks of yellow flowers that is over your head, there's a good chance that it's Black Mustard. The seeds of Black Mustard are often used in the table condiment, Mustard. Among the many Brassica spp. and Synapis spp. (Mustards), Black Mustard can be identified by considering the following characteristics: 1) It is often quite tall, 2) the slender siliques are appressed together near the stalk of each raceme, 3) the siliques have distinctive beaks and are always less than ¾" long, 4) the leaves narrow clasp the stems, 5) the terminal lobe of the lower leaves is much larger than the latter lobes, and 6) the lower leaves often have short stiff hairs and feel bristly to the touch. Other mustards are often lacking one or more of these features.