wild lettuce

noun
any of various uncultivated species of lettuce, growing as weeds in fields and waste places, especially a North American species, Lactuca canadensis.
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wild lettuce
 
n
any of several uncultivated lettuce plants, such as Lactuca serriola (or L. scariola) of Eurasia and L. canadensis (horseweed) of North America, which grow as weeds and have yellow or blue flowers, milky juice in the stem, and prickly leaves: family Asteraceae (composites)

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Example sentences
Wild lettuce accessions had higher carotenoid content than cultivated lettuces.
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