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.