- Sisymbrium altissimum is an annual/biennial herb native to Eurasia. Plants can reach almost 5 ft. (1.5 m) in height.
- Cauline (stem) leaves are alternate, 0.5-5 in. (1.3-12.7 cm) long and decrease in size up the stem.
- Flowering occurs in late spring to summer, when small, 4-petaled, yellow to white flowers develop in groups at the apex of the stems.
- Fruits are narrow seed pods that are 2-4 in. (5-10 cm) long and contain more than 120 seeds.
- Ecological Threat
- Sisymbrium altissimum was first seen in the United States in 1878 in Philadelphia; seeds were probably introduced accidentally in ship ballast. Plants invade fields, open forests, and other disturbed open areas.
- Howard, Janet L. 2003. Sisymbrium altissimum, Fire Effects Information System, U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory
- University of California, Jepson Flora Project
- Flora of North America, www.eFloras.org
- USDA NRCS PLANTS
- USDA ARS GRIN