This plant is about 2' tall with enormous dandelion like leaves, a tall multi-branched fleshy flower stalk, with yellow flowers. It's growing in front of the Post office, so, I grabbed some unopened seed heads in case the landscapers yank them out. What is it, and, is any part of the plant edible?I tried to add a photo , but, had to wait. Apparently, it's wild lettuce - British Rocket. I'm not completely sure, though. It's 100% thornless - no hairs, either.