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This is a rather odd-looking member of the Mustard family as the lobes of the upper leaves are linear, even thread-like in appearance. The Sisymbrium spp. (Hedge Mustards) belong to a rather large group of plants within the Mustard family that have yellow flowers and long narrow seedpods called "siliques." These siliques may be round, flattened, or 4-angled in circumference, and their endpoints may taper into stipes or beaks. The siliques of Tumble Mustard are narrowly cylindrical and they lack either stipes or beaks. Among the Hedge Mustards in Illinois, Tumble Mustard has the longest siliques, spanning 2" or more in length when they are fully mature. Other Hedge Mustards (Sisymbrium officinale and Sisymbrium loeselii) in Illinois have siliques that are less than 2" in length, and the terminal lobes of their upper leaves are non-linear, often lanceolate in shape.


Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© John Hilty

Source: Illinois Wildflowers

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