Lactuca muralis - the wall lettuce - is a 2–4 feet (0.6–1.2 m) tall perennial flowering plant of the genus Lactuca in the dandelion tribe within the daisy family, sometimes also referred to Mycelis muralis. Its chief characteristic is an open airy clumps of yellow flowers. Each "flower" is actually a composite flower, consisting of 4-5 petal-like flowers (strap or ray flowers), each approximately 5–7 mm (0.20–0.28 in) in length.
Lactuca muralis is similar to Lactuca serriola L. and Lactuca virosa L. but distinguished, having only 5 florets.
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