I will check next time I get a chance to see if there is sap. Good suggestion!not offhand. if you break a leaf off is the sap milky?
at first glance i'm tempted to say some type of leaf lettuce, but i'm not really an expert lettuce grower. and i certainly would not take my word for it being edible or not either.
Wow that's a great lead! Thanks! It looks very similar!The phone says “Wall Lettuce”?
Lactuca muralis - Wikipedia
en.m.wikipedia.org