I'm curious and kinda partial to keeping it but I've been seriously burned by following that notion before.
Would like to know if this is a weed or just an unusual volunteer. I've never seen it around here.
I've checked out a lot of pics of Evening Primrose (Oenothera biennis) and I am inclined to agree with SS and pdf . . . btw, it is not mildew. LOL - - that is good old Texas dirt - - we haven't had rain in more than 60 days and that is just good old dirt, Texas style.
My thanks to everyone for pitching in on this one.