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Jean Tosti Wikipedia
Prickly lettuce
Lactuca serriola

Prickly lettuce (Lactuca serriola) is an invasive plant. It is a native of Eurasia and was first detected in Michigan in 1984.

Prickly lettuce is found in disturbed areas such as farmland, roadsides and urban lots throughout the United States The leaves grow along a spiny stem and get progressively smaller as they reach its top. They emit a milky sap when cut. .