''Lactuca muralis'', the wall lettuce, is a perennial flowering plant of the genus ''Lactuca'' in the dandelion tribe within the daisy family, also referred to ''Mycelis muralis'' Dumort.
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 , each approximately 5–7 mm in length. There are no disc flowers. ''Lactuca muralis'' grows about 2–4 feet tall with the lower leaves pinnately toothed.. more