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Field Sowthistle - Sonchus arvensis
Family: Asteraceae

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Description

Field sowthistle is a glabrous perennial arising from an extensive creeping root system. The .5 to 1.5 m tall plants exude a milky juice when injured. The leaves are alternately arranged. The lower to middle cauline leaves have prickly margins and vary in shape from pinnate-lobulate to dentate to subentire. The upper leaves are less lobed and have auriculate-clasping bases. The inflorescence is a head, 2-5 cm wide, with few to several heads arranged in a corymbiform cluster. The yellow flowers are all ligulate. The involucral bracts and peduncles have distinctive gland tipped hairs. The fruit is a ridged achene with a few white bristles.

Interesting facts

Sowthistle is common in gardens, cultivated crops, ditchbanks, and waste areas. The plant is adapted to a number of environments but can be problematic in areas that have sufficient moisture such as irrigated lands.

Links to more information

US Army Corp Noxious Plant Database

Website, video, and graphics by Rob Nelson
For more information on this plant or management please contact US Army Corp of Engineers

 
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