Hedge Mustard (Sisymbrium officinale)

Flowering plant as seen in May and June.  Plants can be 1 to 4 feet tall.  Leaves divided with coarse, pointed teeth.  Lower leaves 4 to 10 inches long, often in form of rosette; upper leaves much smaller.  Flowers yellow, 4-petaled and at the tips of elongated pod-bearing branches.  At maturity fruit stem-like pod that tends to parallel the fruiting stem.