Opium Lettuce is also known as wild lettuce or poor man's lettuce. Many species grow over the whole united states, it's look alikes are dandelion, chicory, and thistle. You can distinguish it from its look alikes by flipping the leaf over and looking at the spine that runs up the center of the leaf, if should have little spines, running up the midrib. These spines may not be present in immature plants, but I have dandelion, thistle and wild lettuce growing in my yard and if you just take some ti