It looks very much like a member of the mustard family. Maybe Wintercress aka Barbarea. Count the petals on the flower. If there are Four petals on each flower, it is a mustard.
I just got home and saw those pictures of the 4-petaled mustard plants in the San Francisco bay area. Those pictures are much more lush than mine - but I'll try to snap a closeup of the flower in the morning and compare.
I'll report back what I find in comparison to the net on the "wild mustard".
BTW, if it is wild mustard, might I be able to make mustard out of it? (I'll check - but I figured I'd ask also.)
It would be helpful to see a closeup of the flowers, Danny. June seems awfully late for wild mustard here. As you say, it usually looks lusher, and I don't usually notice it after about March or early April.
Have you ever eaten it cooked? My grandma used to cook it for us all the time and taught me how. You pull the leaves off the plant .. medium to smaller leaves are more tender, and then you boil them like you would spinach leaves 'til they are tender. After that you drain the boiled leaves and squeeze all the water out of the leaves you can get to come out of them. Next you add some oil to a frying pan, and break up the boiled leaves into the hot grease. Break 2 or 3 fresh eggs over the poke in the hot grease and stir fry the eggs with the poke. Add a bit of salt to taste while it's cooking. MMMMMMMmmm!!
We've a new weed infestation this year here in northern NJ. I have assumed it came in with Superstorm Sandy last fall, as it is ubiquitous this spring/summer and I have never seen it before, or surely never did in any great numbers such that it made an impression on me.
Anyway, check out field hawkweed photos and see if they match. That is what seems to be all over the sides of the roads here now.
I didn't know what the seeds looked like, but I could easily see the green central florets, unveined yellow flower petals and what looks like six stamens (four tall, and two short) surrounding the one pistil as men surround a pretty lady at a bar:
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