Sisymbrium erysimoides, known as smooth mustard, is a plant in the family Brassicaceae. It is found on roadsides and wasteland, and as a weed of arable land. A native to western Mediterranean region, it is now well-established throughout the world.
Cool season annual, erect, glabrous or shortly pubescent herb 10âÂÂ80 cm tall. Basal leaves are up to 15 cm long, lyrate-pinnatifid, toothed, petiolate, reducing to lanceolate, mostly toothed. Flowerheads are paniculate. Sepals are 1âÂÂ2 mm long and glabrous. Petals are 1âÂÂ2.5 mm long, yellow to pale yellow. Siliqua are linear, straight, horizontal, 2.5âÂÂ5 cm long, 1 mm wide and attenuate into a style; pedicels are thick and 2âÂÂ5 mm long. Flowering is in late winter and spring.
It was introduced in Australia where it is now widespread in dry regions west of the Tablelands.
Young leaves are eaten as salad.
Ethnobotanically used as a medicinal plants for respiratory disorders. Antioxidant molecules - Apigenin, apigenin-7-O-galactoside, apigenin-7-O-ò-rhamnoside, apigenin-7-O-glucuronide, kaempferol, apigenin-7-O-rhamnosyl galactoronide, kaempferol-3-xyloside-7-galactoside, quercetin-6,4â²-dimethoxy-3-fructo-rhamnoside, quercetin 4â²-methoxy-3-fructo-rhamnoside - were reported to be identified from the plant. The whole plant extract was reported to have anti-inflammatory and analgesic activities.