Sisymbrium erysimoides, known as smooth mustard,[1] is a plant in the family Brassicaceae.

Cool season annual, erect, glabrous or shortly pubescent herb 10–80 cm tall.

It was introduced in Australia where it is now widespread in dry regions west of the Tablelands.

[2][4] Antioxidant molecules - Apigenin, apigenin-7-O-galactoside, apigenin-7-O-β-rhamnoside, apigenin-7-O-glucuronide, kaempferol, apigenin-7-O-rhamnosyl galactoronide, kaempferol-3-xyloside-7-galactoside, quercetin-6,4′-dimethoxy-3-fructo-rhamnoside, quercetin 4′-methoxy-3-fructo-rhamnoside - were reported to be identified from the plant.

[5] The whole plant extract was reported to have anti-inflammatory and analgesic activities.