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Lactuca virosa. Lactuca virosa is a plant in the Lactuca (lettuce) genus, often ingested for its mild analgesic and sedative effects. [2] It is related to common lettuce (), and is often called wild lettuce, bitter lettuce, laitue vireuse, opium lettuce, poisonous lettuce, tall lettuce, great lettuce [3] or rakutu-karyumu-so.
"Wild lettuce" commonly refers to the wild-growing relatives of common garden lettuce. Many species are common weeds. Lactuca species are diverse and take a wide variety of forms. They are annuals, biennials, perennials, or shrubs. [2] Their flower heads have yellow, blue, or white ray florets. Some species are bitter-tasting.
Lactuca quercina is a species of wild lettuce native to Europe and Asia. It is an annual or biennial herb in the tribe Cichorieae within the family Asteraceae growing from a taproot to maximum heights of 50–200 cm (19.5–78.5 in) or more.
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Lactuca serriola is the wild progenitor of cultivated lettuce (Lactuca sativa) and can be affected by lettuce downy mildew, one of the most serious diseases of lettuce. [12] L. serriola has shown resistance to the plant pathogen Bremia lactucae, the cause of the disease. [12]
Lettuce varieties will cross with each other, making spacing of 1.5 to 6 m (60 to 240 in) between varieties necessary to prevent contamination when saving seeds. Lettuce will also cross with Lactuca serriola (wild lettuce), with the resulting seeds often producing a plant with tough, bitter leaves.
Lactuca floridana, commonly known as woodland lettuce, [3] Florida lettuce, [4] or false lettuce [5] is a North American species of wild lettuce. It is native across much of central Canada and the eastern and central United States. Lactuca floridana is an annual or biennial plant in the Cichorieae (dandelion) tribe within the Asteraceae (daisy ...