AppearanceSisymbrium orientale is an annual herb. It is a species of flowering plant in the mustard family known by the common names Indian hedgemustard and Eastern rocket.Foliage Oriental mustard produces a hairy, branching stem up to about 11.8 in. (30 cm) tall. The basal leaves are divided into deep lobes or toothed leaflets. Leaves higher on the stem have lance-shaped blades with small separate lobes near the base.Flowers The top of the stem is occupied by a raceme (is a inflorescence that is unbranched and indeterminate and bears pedicellate flowers) of flowers with light yellow petals each measuring up to a centimeter long.Fruit The fruit is a silique which can be up to 3.9 in. (10 cm) long.Ecological ThreatSisymbrium orientale infests roadsides, ditches and fields. It is native to Europe, Asia, and North Africa.