HEDGE MUSTARD, Sisymbrium officinale (L.) Scop. 1, erect appressed pods; 2, lower leaf; 3, upper part of plant. Annual or winter annual, reproducing by seeds. Stems 1 to 4 feet (0.3 to 1.2 m) tall, erect, stiff, with a few branches above. Leaves divided, with coarse, pointed teeth. Lower leaves 4 to 10 inches (10 to 25 cm) long, often in form of a rosette; upper leaves much smaller. Flowers yellow, about 1/8 inch (3 mm) in diameter, 4-petaled, in small clusters at the tips of the elongated pod bearing branches. Pods erect, following the stern, sharp pointed, about 1/2 inch (13 mm) long, somewhat hairy. Seeds greenish-brown, about 1/16 inch (1.5 mm) long, irregularly oval with a roughened surface. Found in grain fields and waste places.